- 1Department of Human and Social Sciences, University of Salento, Lecce, Italy
- 2Lab of Applied Psychology, Department of Human and Social Sciences, University of Salento, Lecce, Italy
- 3Department of Human and Social Science, University of Bergamo, Bergamo, Italy
- 4Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
Introduction: Given the vulnerability of children during the COVID-19 pandemic, paying close attention to their wellbeing at the time is warranted. The present protocol-based systematic mixed-studies review examines papers published during 2020–2022, focusing on the impact of the COVID-19 pandemic on children's internalizing/externalizing symptoms and the determinants thereof.
Method: PROSPERO: CRD42022385284. Five databases were searched and the PRISMA diagram was applied. The inclusion criteria were: papers published in English in peer-reviewed journals; papers published between January 2020 and October 2022 involving children aged 5–13 years; qualitative, quantitative, and mixed studies. The standardized Mixed Method Appraisal Tool protocol was used to appraise the quality of the studies.
Results: Thirty-four studies involving 40,976 participants in total were analyzed. Their principal characteristics were tabulated. The results showed that children's internalizing/externalizing symptoms increased during the pandemic, largely as a result of disengagement from play activities and excessive use of the internet. Girls showed more internalizing symptoms and boys more externalizing symptoms. Distress was the strongest parental factor mediating children's internalizing/externalizing symptoms. The quality of the studies was appraised as low (n = 12), medium (n = 12), and high (n = 10).
Conclusion: Gender-based interventions should be designed for children and parents. The studies reviewed were cross-sectional, so long-term patterns and outcomes could not be predicted. Future researchers might consider a longitudinal approach to determine the long-term effects of the pandemic on children's internalizing and externalizing symptoms.
Systematic review registration: https://www.crd.york.ac.uk/prospero/display_record.php?ID=CRD42022385284, identifier: CRD42022385284.
1. Introduction
In most countries, the main restrictive measures applied to control the spread of COVID-19 between 2020 and 2022 included total lockdowns (or “sheltering in place” in North America), the closure of educational institutions and workplaces, social isolation, and prohibitions on gatherings. These restrictions significantly affected mental health within the general population (Hossain et al., 2020)—for instance, high levels of stress amongst health care professionals (Batra et al., 2020; Muller et al., 2020; Newby et al., 2020; Franklin and Gkiouleka, 2021) and low levels of wellbeing and even burnout amongst educators (partly as a response to the shift from one-to-one to remote teaching; Chan et al., 2021; Ozamiz-Etxebarria et al., 2021; Levante et al., 2023). Meanwhile, many parents found it difficult to balance work and family life (Graham et al., 2021). Because schools were closed, they were obliged to serve a range of roles (e.g., those of educator, caregiver, and playmate) for their typically developing children (Spinelli et al., 2020; Sun et al., 2022) or their atypically developing children (Levante et al., 2021; Calderwood et al., 2022).
Confinement and uncertainty (Petrocchi et al., 2022) had detrimental effects on several aspects of children's psychological functioning, such as high levels of anxiety (Orgilés Amorós et al., 2021; Aras Kemer, 2022), depression (Duan et al., 2020; Orgilés Amorós et al., 2021), hyperactivity and peer issues (Ravens-Sieberer et al., 2022), attention problems, aggressive behaviors (Khoury et al., 2021), and nervousness and irritability (Mariani Wigley et al., 2021). Some children developed sleep problems (Fidanci et al., 2021), insomnia (Bacaro et al., 2021), and eating disorders (Capra et al., 2023) consequent upon the disruption of their daily routines. Although COVID-19 was acknowledged by the authorities to pose a minute risk to children (Shekerdemian et al., 2020), previous literature has shown that they are more vulnerable to stress and low levels of wellbeing during emergencies and disasters (Danese et al., 2020; Raccanello and Vicentini, 2022).
In light of the above, we decided to carry out a systematic review of empirical studies investigating the impact of the pandemic on children's mental health. We focused on middle childhood, which encompasses the ages 5–13 years. According to Erikson's psychosocial model (Erikson, 1993), the circle of influence on children widens during this period (largely as a result of going to school and social interactions generally). When children have satisfactory social relationships (i.e., they develop a sense of industry), they perform developmental tasks successfully; when they do not, they are at risk of developing emotional and behavioral problems (e.g., a sense of inferiority; Erikson, 1993).
During the pandemic, children were compelled to forsake in-person social interactions for prolonged periods, and a pattern of internalizing and externalizing symptoms emerged (Nivard et al., 2017). Internalizing symptoms are an expression of an individual's internal distress (e.g., trait anxiety and depression; Cosgrove et al., 2011). Externalizing symptoms are expressed outwardly (e.g., aggression, defiance, and behavioral problems; Cosgrove et al., 2011). Pre-pandemic evidence (Bukowski and Adams, 2005; Laursen et al., 2007) revealed that social isolation during middle childhood negatively affected the mental health of adolescents and young adults (e.g., in terms of depression, anxiety, aggression, and anger).
To the best of our knowledge, four systematic reviews of empirical studies carried out during the pandemic have been published, primarily evaluating the mental health of children overall. Ma et al. (2021) measured the impact of the COVID-19 pandemic on children's and adolescents' depressive symptoms, trait anxiety, sleep problems, and post-traumatic stress symptoms. The three others (Aarah-Bapuah et al., 2022; Amorós-Reche et al., 2022; Ng and Ng, 2022) explored participants' emotional and mood problems (Amorós-Reche et al., 2022), depressive symptoms and anxiety (Aarah-Bapuah et al., 2022; Amorós-Reche et al., 2022; Ng and Ng, 2022), withdrawal (Ng and Ng, 2022), and anger and irritability (Ng and Ng, 2022).
Although these reviews provide valuable information, they have certain limitations. Amorós-Reche et al. (2022) and Ng and Ng (2022) examined studies published over 2 years (i.e., 2020–2021), but the other two papers (Ma et al., 2021; Aarah-Bapuah et al., 2022) covered only 6–9 months. Ma et al. (2021) and Amorós-Reche et al. (2022) limited their electronic searches to studies carried out in Spain and China/Turkey, respectively. The most recent review, by Ng and Ng (2022), extracted data from papers published up to February 2022 but did not include mixed studies carried out during the pandemic. Given that the impact of the latter on children's mental health is an exponentially growing field of research, an updated systematic review summarizing the results published thus far on children's internalizing/externalizing symptoms during the period is needed. The present study systematically extracted and reviewed studies that used qualitative, quantitative, and mixed study designs and applied a narrative approach to synthesize the findings in accordance with a standardized protocol. The research questions were formulated according to the PEO format. We extracted papers on typically developing children (Population) carried out during the pandemic (Exposure) that investigated their internalizing and externalizing symptoms (Outcomes), then formulated the following research questions:
RQ1: What was the impact of the COVID-19 pandemic on children's internalizing/externalizing symptoms?
RQ2: What psychological determinants were associated with or contributed to their internalizing/externalizing symptoms?
RQ3: Were there any gender differences in terms of children's internalizing/externalizing symptoms?
RQ4: Did any parent-related psychological determinants associate with or contribute to children's internalizing/externalizing symptoms?
2. Methods and materials
The review protocol was pre-registered on PROSPERO (Protocol No. CRD42022385284).
2.1. Search strategy
To extract the studies for review, we applied the updated Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) diagram (Page et al., 2021). An initial electronic search of MEDLINE, PsycINFO, CINAHL, SCOPUS, and Web of Science was carried out in October 2022. In accordance with the PEO format, the keywords and MeSH terms were combined using the Boolean operators AND and OR: child*, OR children AND COVID* OR coronavirus OR corona OR COVID-19 OR COVID19 OR COVID OR SARS-CoV-2 OR SARSCoV-2 OR novel coronavirus OR SARS virus OR pandemic OR severe acute respiratory syndrome AND internal* OR external* OR emotion* OR behav*.
We confined the studies written in English in the fields of psychology, social science, and health but did not impose restrictions on the countries in which the studies were carried out. The inclusion criteria were: (a) participants recruited from the general population; (b) participants aged ≥5 and ≤ 13 years; (c) papers published in peer-reviewed journals; (d) papers published between January 1, 2020 and the end of October 2022; (e) papers based on COVID-19-related effects; and (f) qualitative, quantitative, and mixed study designs. The exclusion criteria were: (a) participants aged ≤ 4 and ≥14 years; (b) papers that did not report the participants' age; (c) papers from other research fields (e.g., medicine; biology); (d) dissertations, conference abstracts and/or papers, editorials, opinions, commentaries, recommendations, letters, books, and book chapters; (e) other systematic and non-systematic reviews; and (f) validation studies.
2.2. Selection of the studies
The PICOS (Bowling and Ebrahim, 2005; Hong et al., 2018) protocol was used to analyze the content of the studies.
Participants: typically developing children aged 5–13 years;
Intervention: studies assessing children's internalizing and externalizing symptoms during the COVID-19 pandemic;
Comparison: Gender differences between symptoms;
Outcomes: levels of children's internalizing and externalizing symptoms; children's psychological determinants associated with the Intervention variables; parental psychological determinants associated with or contributing to the Intervention variables.
Study: quantitative; qualitative; mixed.
Figure 1 maps the selection process. Following the Identification stage of PRISMA, we searched papers in which our keywords appeared in either the title, abstract, subject heading, or keywords list. Each keyword combination was tabulated in an Excel spreadsheet and 4,403 records were ordered alphabetically. All duplicates (n = 3,050) were removed.
A total of 1,353 papers were screened for the availability of the full text by two of the present authors (AL & CM); six papers were excluded because the full text could not be retrieved. A total of 1,347 papers were assessed and a total of 1,313 papers were excluded. Figure 1 details the number of papers that were excluded for each criterion. The inter-rater agreement was calculated using a set of 50 randomly selected papers; these were independently screened by AL and CM, and their disagreements were arbitrated by a third author (FL). The inter-rater agreement was good (Cohen's κ = 0.93). Thirty-four papers were included in the final review.
2.3. Quality appraisal
The quality of the papers was evaluated in accordance with the updated standardized Mixed Method Appraisal Tool protocol (MMAT; Hong et al., 2018). This protocol is used to evaluate five principal categories: qualitative studies (via four items), randomized control trials (via four items), non-randomized studies (via four items), quantitative descriptive studies (via four items), and mixed methods studies (via three items). For each category, a set of five questions are provided; a 3-point Likert scale (1 = yes and 0 = no and can't tell) is used to measure responses.
The MMAT comprises a spreadsheet into which the reviewer first inserts the study information (a reference ID number, the first author of the study, the publication year, and the full citation). The reviewer then selects from a drop-down menu the answer (yes vs. no vs. can't tell) to two preliminary screening questions (“Are there clear research questions?” and “Do the collected data allow to address the research questions?”). If no or can't tell are selected, the paper is excluded from the review. If yes is selected, the reviewer answers the five questions pertaining to the category of study.
In the present case, the inter-rater agreement was calculated using a set of 10 randomly selected papers. They were independently evaluated by two authors (AL & CM) and the disagreements were arbitrated by a third (FL). The inter-rater agreement was good (Cohen's κ = 0.95).
To calculate the overall score regarding the quality of α study, the MMAT developers suggest summing up the responses. They do not, however, recommend a cut-off point to categorize the overall score, arguing that reviewers make their own decision. We ranked the papers as low when they were rated as a 1 or 2, medium when they were rated as a 3, and high when they were rated as a 4 or 5.
2.4. Data synthesis
Because the results of the studies were heterogenous, a narrative approach was deemed appropriate. Section 3 herein comprises six parts. First, we provide an overview of the methodological characteristics of the studies (Section 3.1); the next four sections synthesize the findings and address the present study's research questions (Sections 3.2, 3.3, 3.4, and 3.5); and the sixth section summarizes the result of the quality appraisal (Section 3.6).
3. Results
Details of the main studies are tabulated in Table 1. For each study, we extracted the country and the time the data were collected; the overall methodology (i.e., quantitative vs. qualitative vs. mixed studies and cross-sectional vs. longitudinal); the strategies used to recruit the participants (probabilistic vs. non-probabilistic method and the specific strategy used); the method used to collect the data (online vs. face-to-face); and the individuals who completed the survey (parent vs. child). We also reported the sample's characteristics [i.e., the size of the total sample and the sub-samples (when present), gender distribution, mean age, standard deviation, and age range] and the outcome measures administered to evaluate children's internalizing and externalizing symptoms, the psychological determinants that were associated with or contributed to them, and any parent-related psychological determinants.
We then summarized the relevant findings of each study and organized them according to the research questions. We reported the main results (RQ1), the psychological determinants (RQ2), gender differences (RQ3), and the parental role (RQ4). In the last column of Table 1, we report the quality appraisal for each study (low vs. medium vs. high) based on the MMAT protocol.
3.1. Methodological characteristics
A total of 34 studies were included in this systematic mixed studies review. They derived from 15 countries across three Continents (Europe, America, and Asia). The majority (n = 18) were European, nine were Asian, and seven were American (n = 6 North America; n = 1 South America). Table 1 is structured according to the category of the research design: quantitative (n = 30), qualitative (n = 3), and mixed studies (n = 1).
Except for five quantitative studies (Duan et al., 2020; Rajabi et al., 2021; Scaini et al., 2021; Andrés et al., 2022; Balayar and Langlais, 2022) and one qualitative study (Aras Kemer, 2022), the papers provided information on when the data were collected. Most of them were quantitative and collected data during the first 7 months of 2020 (Liang et al., 2020; Morelli et al., 2020, 2022; Petrocchi et al., 2020; Andrés-Romero et al., 2021; Bate et al., 2021; Bianco et al., 2021; Cellini et al., 2021; Li and Zhou, 2021; Liu et al., 2021, 2022; Mariani Wigley et al., 2021; Wang et al., 2021a,b,c; Dodd et al., 2022; Lionetti et al., 2022; Martiny et al., 2022; Oliveira et al., 2022; Ravens-Sieberer et al., 2022), as did the qualitative studies (Idoiaga et al., 2020; Cortés-García et al., 2021). One quantitative study (Penner et al., 2022) collected data during the first months of 2021 (February–April).
Most of the papers applied a cross-sectional quantitative study design (n = 27); three collected longitudinal quantitative data. All three qualitative studies were cross-sectional. The mixed study applied a longitudinal design for the quantitative section and used cross-sectional data for the qualitative section. Of the four longitudinal studies (Khoury et al., 2021; Vira and Skoog, 2021; Sun et al., 2022; Wenter et al., 2022), three (Khoury et al., 2021; Vira and Skoog, 2021; Sun et al., 2022) compared data collected before and during the pandemic. Lionetti (Lionetti et al., 2022) collected data in January 2020 and April 2020. Sun et al. (2022) compared data collected during Spring 2019 and Spring 2020. Khoury et al. (2021) compared data collected during 2016–2018 with those collected during May–November 2020. The mixed study included data collected during four pandemic waves between 2020 and 2022 (Table 1).
Eighty-five percent of the studies (n = 26 quantitative studies; n = 2 qualitative studies; n = 1 mixed study) recruited participants using non-probabilistic sampling strategies. The remaining studies (n = 4 quantitative studies; n = 1 qualitative study) used probabilistic strategies (Table 1).
As expected, because of the COVID-19 restrictions, all the studies collected data remotely, inviting participants to complete an e-survey disseminated through the main social platforms and/or mailing lists. Only two longitudinal studies (Vira and Skoog, 2021; Sun et al., 2022) collected data face-to-face (before the pandemic) and online (during the pandemic).
Most of the study questionnaires (n = 27) were completed by a parent or caregiver; two (Martiny et al., 2022; Ravens-Sieberer et al., 2022) were completed by both parents and children; and five (Duan et al., 2020; Idoiaga et al., 2020; Cortés-García et al., 2021; Vira and Skoog, 2021; Aras Kemer, 2022) were completed by the children. A total of 40,976 participants were enrolled on the studies. For the 30 quantitative studies, the total sample ranged between 80 and 12,186 participants; for the three qualitative studies, it ranged between 9 and 228. The mixed study involved 2,691 participants.
It is worth noting that the majority of the studies enrolled children from a wider age range (e.g., 5–18). Because the present study is focused on middle childhood (i.e., children aged 5–13), we extrapolated information regarding the size of the sub-group(s). In the quantitative studies, the sub-groups varied from 233 to 1,919 participants; two of the qualitative studies divided the total sample into sub-groups, and only one reported the number (n = 9). The sub-group in the mixed study comprised 1,740 participants.
We extracted information on the gender distribution percentage for each study. The majority of the quantitative studies (n = 21) reported the gender distribution percentage for both the total and sub-groups (where applicable); eight studies (Andrés-Romero et al., 2021; Liu et al., 2021; Orgilés Amorós et al., 2021; Wang et al., 2021b; Andrés et al., 2022; Penner et al., 2022; Ravens-Sieberer et al., 2022) reported the gender percentage for the total sample only. One study (Wang et al., 2021c) did not report the gender distribution. All the quantitative studies were balanced, as was the mixed study. Two qualitative studies (which were similarly balanced) provided detailed information on gender, while one study (Idoiaga et al., 2020) did not offer any.
We also calculated the participants' mean age, standard deviations, and age range(s), though this was not possible for six quantitative studies (Duan et al., 2020; Andrés-Romero et al., 2021; Wang et al., 2021a,b,c; Andrés et al., 2022) because the necessary information was not available. Of the quantitative studies that split the total samples into sub-groups, seven did not report the above details (Duan et al., 2020; Andrés-Romero et al., 2021; Liu et al., 2021; Orgilés Amorós et al., 2021; Andrés et al., 2022; Penner et al., 2022; Ravens-Sieberer et al., 2022). Three of the qualitative studies (Idoiaga et al., 2020; Cortés-García et al., 2021; Aras Kemer, 2022) did not report the participants' ages. Finally, the mixed design study authors did not provide the mean ages and the standard deviations of the total sample, though they did for the sub-samples.
Table 1 displays information on the measures administered by the authors of the studies. We filed the outcome measures according to the psychological construct(s): the measure(s) assessing children's internalizing and externalizing symptoms; the tool(s) evaluating the children's psychological determinant(s); and the measure(s) assessing the parent-related psychological determinants(s). For each measure, we point out the full name, reference, and the psychological construct that was evaluated.
The majority of the quantitative studies applied validated measures; most applied the Strength and Difficulties Questionnaire (Goodman, 2003). Three papers (Petrocchi et al., 2020; Mariani Wigley et al., 2021; Balayar and Langlais, 2022) applied non-validated measures. To evaluate the children's psychological determinant(s), 11 (Liang et al., 2020; Bate et al., 2021; Cellini et al., 2021; Mariani Wigley et al., 2021; Rajabi et al., 2021; Scaini et al., 2021; Dodd et al., 2022; Lionetti et al., 2022; Liu et al., 2022; Oliveira et al., 2022; Penner et al., 2022) applied validated measures only, nine (Morelli et al., 2020, 2022; Petrocchi et al., 2020; Andrés-Romero et al., 2021; Li and Zhou, 2021; Wang et al., 2021a,b,c; Balayar and Langlais, 2022) applied non-validated measures only, and four (Duan et al., 2020; Vira and Skoog, 2021; Martiny et al., 2022; Ravens-Sieberer et al., 2022) applied validated and non-validated measures. To evaluate parental psychological determinants, 25 applied validated measures, five (Bate et al., 2021; Bianco et al., 2021; Wang et al., 2021a; Andrés et al., 2022; Martiny et al., 2022) used both validated and non-validated measures, and one (Orgilés Amorós et al., 2021) applied a non-validated measure. All of the qualitative studies assessed children's internalizing and externalizing symptoms using non-validated measures; the children's and parents' psychological determinants were not evaluated. Finally, the mixed study applied validated measures to evaluate children's internalizing and externalizing symptoms and non-validated measures to assess children's and parent's psychological determinants.
3.2. The impact of the COVID-19 pandemic on children's internalizing and externalizing symptoms
The present section addresses RQ1. As Table 1 shows, one study (Wang et al., 2021c) estimated that 17.85% of participants were above the threshold for externalizing symptoms only. The longitudinal studies revealed that the levels of both internalizing (Khoury et al., 2021; Lionetti et al., 2022) and externalizing (Khoury et al., 2021) symptoms were higher during the pandemic than they were previously. One longitudinal study (Sun et al., 2022) reported that the levels of externalizing symptoms were higher than internalizing ones during the pandemic. Only one study (Vira and Skoog, 2021) found no difference before and during the pandemic. The quantitative cross-sectional studies reported high levels of internalizing (Duan et al., 2020; Liang et al., 2020; Cellini et al., 2021; Orgilés Amorós et al., 2021; Andrés et al., 2022; Morelli et al., 2022; Ravens-Sieberer et al., 2022) and externalizing (Cellini et al., 2021; Mariani Wigley et al., 2021; Andrés et al., 2022; Ravens-Sieberer et al., 2022) symptoms compared with the threshold. By contrast, one study (Balayar and Langlais, 2022) reported low levels of both types of symptoms during the pandemic compared with the period before. The qualitative studies generated mixed results. Two suggested that children experienced low (Idoiaga et al., 2020; Cortés-García et al., 2021) levels of internalizing symptoms, while one (Aras Kemer, 2022) suggested the opposite. Finally, the quantitative results of the longitudinal mixed study demonstrated clinical scores (i.e., over the threshold) for internalizing and externalizing symptoms. The qualitative data of the mixed study did not focus on children's internalizing and externalizing symptoms.
3.3. The psychological determinants associated with or contributing to children's internalizing and externalizing symptoms
The present section addresses RQ2. We analyzed the associations between children's internalizing/externalizing symptoms and their relevant psychological determinant(s). Several quantitative studies demonstrated that high levels of children's internalizing (Petrocchi et al., 2020; Rajabi et al., 2021; Oliveira et al., 2022) and externalizing symptoms (Rajabi et al., 2021; Oliveira et al., 2022) were associated with low engagement during play activities. Furthermore, more widespread use of the internet during the pandemic led to high levels of internalizing symptoms (Duan et al., 2020; Liu et al., 2022). The qualitative studies did not examine this issue. The mixed studies revealed that the constant recommendations and restrictions imposed during the lockdowns increased children's internalizing and externalizing symptoms.
3.4. Gender differences between children's internalizing and externalizing symptoms
The present section addresses RQ3. The 30 quantitative studies reported mixed findings. Some studies (Duan et al., 2020; Bate et al., 2021; Bianco et al., 2021; Andrés et al., 2022; Liu et al., 2022) found that female children reached higher levels of internalizing symptoms than their male peers, with only two studies (Wang et al., 2021a,c) showing the opposite. Three studies (Bate et al., 2021; Rajabi et al., 2021; Andrés et al., 2022) reported that male children showed more externalizing symptoms than their female peers. One study (Liu et al., 2021) indicated that female children reached higher levels of externalizing symptoms than males. Six studies (Morelli et al., 2020, 2022; Scaini et al., 2021; Wang et al., 2021b; Dodd et al., 2022; Penner et al., 2022) observed no difference, and 10 studies (Liang et al., 2020; Petrocchi et al., 2020; Andrés-Romero et al., 2021; Li and Zhou, 2021; Mariani Wigley et al., 2021; Orgilés Amorós et al., 2021; Balayar and Langlais, 2022; Martiny et al., 2022; Oliveira et al., 2022; Sun et al., 2022) did not investigate gender.
These included the qualitative studies. Finally, the quantitative findings of the mixed study revealed that male children showed more externalizing symptoms than females. The qualitative findings of the study did not examine gender differences.
3.5. Parental psychological determinants influencing children's internalizing and externalizing symptoms
The present section addresses RQ4. The 30 quantitative studies examined the associations between parental psychological determinants and children's internalizing/externalizing symptoms. They concluded that several parental psychological determinants, for example, distress (Petrocchi et al., 2020; Bianco et al., 2021; Orgilés Amorós et al., 2021; Wang et al., 2021a; Andrés et al., 2022), hostility (Cellini et al., 2021), and emotional difficulties (Bate et al., 2021; Cellini et al., 2021; Liu et al., 2021) affected their children's internalizing symptoms. In addition, parental self-efficacy, inconsistent discipline (Bronfenbrenner, 1979), conflictual parent–child relationships (Bate et al., 2021), hypermentalizing (Walden et al., 2003), worries (Li and Zhou, 2021), and poor ability to cope with stressful situations (Petrocchi et al., 2020) were negatively associated with children's internalizing symptoms. Similarly, high hostility and inconsistent discipline (Penner et al., 2022), low self-efficacy (Penner et al., 2022), emotional problems (Bate et al., 2021; Cellini et al., 2021), high distress and problems with hypermentalizing (Bianco et al., 2021), and low parental resilience were associated with children's externalizing symptoms.
The results of the quantitative longitudinal studies emphasized that positive and non-conflictual parent–child relationships moderated the degree of change in externalizing symptoms (Lionetti et al., 2022). The results also stressed that children's externalizing symptoms were predicted by parental distress (Sun et al., 2022) and that they were associated with parental hostility (Khoury et al., 2021). One study (Khoury et al., 2021) showed that internalizing symptoms were associated with maternal anxiety. Finally, the qualitative and mixed studies did not consider the influence of parental psychological determinants on children's internalizing and externalizing symptoms.
3.6. Quality appraisal
The quality appraisal of the studies using the MMAT protocol concluded that they were either low (n = 12), medium (n = 12), or high (n = 10). As was pointed out in Section 2.3, the quality of each study was regarded as low when it was rated as a one or two, medium when it was rated as a three, and high when it was rated as a four or five. The details of each study appraisal are tabulated in Table 2 (It should be noted before proceeding that the MMAT protocol takes a rather conservative approach to quality appraisal).
First, the quantitative studies. Item 1 focuses on sampling strategy. As was expected, the preferred choice for the MMAT protocol is probabilistic sampling. For the quantitative studies, 28 used the main non-probabilistic sampling strategies; two (Wang et al., 2021a,c) did not. Item 2 examines whether the sample enrolled for a study is representative of the target population. The majority of the studies (n = 22) met the representativeness criteria proposed by the MMAT protocol (e.g., a clear description of any attempt to achieve the enrolled sample of participants represents the target population). Item 3 evaluates whether the measurements administered in a study are adequate to answer the research question(s). The majority of the studies (n = 24) applied appropriate, validated, and gold-standard measures. Item 4 assesses the risk of non-response bias. Just over one third of the studies (n = 11) met the criterion. In other words, they had a low non-response rate and/or they used statistical compensation for non-responses (e.g., the imputation method). Finally, Item 5 indicates whether the statistical plan is appropriate for answering the research question(s). All the studies, with the exception of two (Orgilés Amorós et al., 2021; Lionetti et al., 2022), clearly stated the statistical plan and adequately computed their analysis of the design and research question(s). The overall quality appraisal of the quantitative studies was low and medium in 11 cases and high in eight cases.
Secondly, the qualitative studies. Item 1 evaluates the suitability of a qualitative approach for answering research question(s). All the studies met this criterion. Item 2 appraises the adequacy of the data collection method. None of the studies used appropriate methods (e.g., validated interviews). For Item 3, which evaluates whether data collection methods are suitable, the appraisal revealed that two of the studies applied methods based on the theoretical framework; one (Idoiaga et al., 2020) did not. Item 4 is used to show whether the interpretation of the findings is supported by the data; all the qualitative studies met this criterion. Finally, Item 5 weighs the relationship between data collection, analysis, and interpretation. Two studies were coherent in this regard; one (Idoiaga et al., 2020) was not. The overall quality appraisal of the qualitative studies was low for one study and high for two.
Finally, because the mixed methods study involved a combination of quantitative and qualitative methods, the reviewer evaluated the quality of both independently, then evaluated the items of the mixed study section; the quality of the quantitative study was high and the quality of the qualitative study was medium (Table 2). The mixed study section met all the methodological quality criteria. It provided a sound rationale for using a mixed study method (Item 1). The quantitative and qualitative results were effectively integrated (Item 2), and a meta-inference (i.e., the overall interpretation derived from integrating the quantitative and qualitative results) was made. Finally, the quantitative and qualitative components did not diverge (Item 4), and the study was found to be trustworthy (Item 5).
According to the user guide provided by the MMAT developers, the quality of a mixed methods study depends on the quality of its quantitative and qualitative components. Therefore, its overall quality cannot exceed the quality of its weakest component. So, in the present instance, the overall quality appraisal was medium.
We were cognisant of two significant issues in our quality appraisal. First, six studies (Duan et al., 2020; Rajabi et al., 2021; Scaini et al., 2021; Andrés et al., 2022; Aras Kemer, 2022; Balayar and Langlais, 2022) did not state when they collected the data, so the research context was not clear. This was a serious flaw because the results could not be interpreted relative to the time frame when the data were collected. The second matter concerned the administration of non-validated measures. We considered this to be important in light of the seriousness of the subject of our research. Such a shortcoming is likely to lead scholars to approach certain findings with caution.
4. Discussion
The present study aimed to complement the literature by synthesizing and appraising evidence of the impact of the COVID-19 pandemic on children's internalizing and externalizing symptoms. In an attempt to address our research questions, we searched five databases, extracted information from 34, and summarized our findings using a narrative approach.
The studies were conducted in several countries, so it became evident that children's mental health is now a matter of global concern. As was expected, the majority of the studies collected data online because of the restrictions imposed by governments worldwide. Most of the studies reported parents' perceptions of their children's functioning using validated measures.
Albeit one study (Wang et al., 2021c) assessed the prevalence of externalizing symptoms only, the results of the 34 studies overall suggested that parents/caregivers were conscious that their children exhibited high levels of internalizing and externalizing symptoms in their children (RQ1). The longitudinal studies, which compared the levels of these symptoms before and during the pandemic, confirmed the negative impact of the COVID-19 pandemic on children's mental health (Khoury et al., 2021; Lionetti et al., 2022; Sun et al., 2022; Wenter et al., 2022). Moreover, an effective prohibition on play activities and an increase in internet use were the main psychological determinants influencing children's internalizing and externalizing symptoms (RQ2).
To better understand why the pandemic had detrimental effects on children's functioning, two studies applied Bronfenbrenner's ecological system theory (Bronfenbrenner, 1977, 1979). During the pandemic, children's microsystems, that is, their immediate environment (e.g., family and school), were damaged (Chachar et al., 2021) by school closures, isolation, and the subsequent cessation of social and peer relationships. Daily routines were disrupted, and this made children more vulnerable. Compromised microsystems created a negative association between children's internalizing/externalizing symptoms and their functioning and adaptive behaviors. Indeed, the results of the studies reviewed herein indicated that high levels of internalizing and externalizing symptoms were part of the reason children withdrew from play activities and began to spend more time online. Social isolation, home confinement, and a prohibition on outdoor play were associated with high levels of depressive symptoms, trait anxiety, aggressive behavior, irritability, and inattention. A lack of shared play during in-presence peer interactions may have led children to feel bored, whereupon they began to be habituated to their toys and engage less in their usual play activities at home. This, in turn, may have led them to play games online in search of enjoyable experiences and to maintain social contact with their peers, albeit virtually. However, because such activities are a poor substitute for face-to-face social interaction, they may have exacerbated children's internalizing and externalizing symptoms.
This vicious cycle has prompted us to reflect on the impact of the pandemic on children's functioning and adaptive behaviors in the context of the family. In particular, parents' fear of the contagion and their concerns thereof may have been conveyed to their children, with deleterious consequences for their wellbeing (i.e., high levels of internalizing and externalizing symptoms) and, in turn, their adaptive behaviors (i.e., play activities). Similarly, the high levels of children's internalizing and externalizing symptoms associated with the disruption of their daily routines and a lack of face-to-face social interactions may have affected their parents' wellbeing, in terms of high levels of distress and maladjustment. This strengthens the argument that the pandemic markedly affected reverse parent–child relationships and that intervention programs involving all family members might play a pivotal role in their recalibration.
The present study confirms the existence of gender differences in internalizing and externalizing symptoms (RQ3) that had been identified in the pre-pandemic era (Yang et al., 2008; Bender et al., 2012). Female children were significantly more vulnerable to internalizing symptoms (e.g., depression and anxiety) compared with their male counterparts. Meanwhile, the latter exhibited externalizing symptoms (e.g., aggressive behaviors, hyperactivity, and inattention) more than their female counterparts. While not all the studies agreed, some (Chen, 2010; Batra et al., 2020; Campbell et al., 2021) reported gender differences between children's internalizing and externalizing symptoms. The implication here is that mental health intervention programs should pay special attention to children's wellbeing and prevent them from developing these symptoms. Some of the studies observed no gender difference (n = 6) or discovered that female children showed more externalizing symptoms than their male counterparts (n = 3). This may be explained by the powerful emotional effects of the pandemic. Restrictive measures, disrupted routines, and so on may have disrupted the self-regulation and the self-control of children and pre-adolescents, regardless of gender. Future longitudinal studies might explore whether these findings derived from the extraordinary situation imposed by the pandemic, or whether other contextual factor(s) may have contributed to the way females and males responded to unforeseen environmental stimuli. Finally, because some studies were methodologically flawed by not taking gender into account, their results should be treated circumspectly.
All the studies revealed that children's functioning was associated with a range of parental psychological determinants (RQ4). The results indicated that children's internalizing symptoms reflected high levels of parental distress, while their externalizing symptoms were primarily a consequence of parental hostility and inconsistently applied discipline. Again, the ecological system theory could be a useful lens through which to examine this topic. For parents, pandemic-related stressors, such as have difficulties paying bills, juggling work and family obligations, managing children's home-schooling, taking care of older parents, and so on may have resulted in higher levels of distress and inefficient parenting. If individual protective psychological factors are low (e.g., parental resilience and/or efficient parenting), it is difficult to counter the negative psychological impact of such stressors. Indeed, they may have led to a deterioration in the parents' mental health and the parent–child relationship. Because the effects were reciprocal, intervention programs must be aimed at both parents and their children.
5. Conclusion
The present study has summarized crucial information on the impact of the COVID-19 pandemic on mental health during the middle childhood stage. It is hoped that it will serve as a wake-up call to governments and policy-makers when designing and providing targeted intervention programs to support children/pre-adolescents and their parents in future situations. Close attention should be paid to internalizing and externalizing symptoms that, when not measured or left untreated, could lead to significant adverse outcomes in children's subsequent developmental stages (Kim-Cohen et al., 2003). In brief, our results support the need for intervention programs that address children's and preadolescents' mental health and wellbeing in the present and future.
6. Strengths and limitations
The present study has several strengths. First, it provides information that might be applied in real-world contexts. The findings demonstrate that, between 2020 and 2022, high levels of internalizing and externalizing symptoms were experienced by children aged 5–13 years. This needs to be taken into account when intervention programs are being developed and/or updated so that the negative short- and long-term effects of the pandemic on children's mental health and wellbeing are mitigated. The findings also demonstrate that parental psychological determinants may have exacerbated children's internalizing and externalizing symptoms. For example, several of the studies showed that a close parent–child relationship can play a positive role in alleviating psychological and social distress (Bate et al., 2021; Lionetti et al., 2022). Therefore, coaching programs targeting parents' strengths and/or protective factors should be developed to help every family member cope with extraordinary environmental conditions.
Another strength of the present study lies in its methodology. First, to ensure methodological rigor, we applied four standardized protocols (PEO, PICOS, PRISMA, and MMAT). In addition, extracting detailed information from quantitative, qualitative, and mixed studies allowed us to significantly extend our knowledge of the internalizing and externalizing symptoms experienced by children aged 5–13 years between 2020 and 2022. Our results will help future researchers overcome the limits and gaps in the literature.
The present study has some limitations. First, although we searched five major databases, others may have yielded other relevant articles. Secondly, we did not search the gray literature. Thirdly, the majority of the studies used e-survey completed by parents; hence, the results should be read in light of parental perceptions of the children's functioning, because these may be prone to error and bias. These limitations should be addressed in future research.
7. Recommendations
We would like to make some clinical and research recommendations because, according to our findings, children's internalizing and externalizing symptoms and their psychological determinants increased during the pandemic. From a clinical perspective, mental health interventions should be designed for what is a vulnerable population. A recent meta-analysis (Jugovac et al., 2022) revealed that attachment- and emotion-focused interventions enable parents to recognize, understand, and respond to their children's emotional needs, so these could be useful in reducing internalizing and externalizing symptoms. They should also take children's gender differences into account, thus contributing to a novel line of research. Moreover, our results highlight the need to design bespoke coaching programs for parents that reduce distress and hostility and promote effective discipline and positive parent–child relationships. In short, government and state agencies responsible for mental health policy should prioritize children's and parents' mental health, directing their efforts toward mitigating the short- and long-term psychological effects of the COVID-19 pandemic.
The present study has several implications for future research. First, our findings revealed that the majority of the studies accessed their data cross-sectionally; it is therefore not yet known how children's internalizing and externalizing symptoms might affect them in the future. Hence, researchers should conduct longitudinal studies that collect data over the next months and beyond, so the effects of restrictive measures such as lockdowns and school closures on the functioning of children, adolescents, and their parents can be investigated in the short-, medium-, and long-term.
Secondly, future studies might validate the non-validated measures that were used in some of the studies so they can be used for other cohorts. Thirdly, two flaws in the MMAT protocol impacted the appraisal of the studies. Albeit probabilistic methods were impracticable during the pandemic, future researchers might endeavor to increase the generalizability of their findings. The second flaw relates to the application of compensatory strategies for non-responses. Authors would be advised to state in their papers the percentage of missing data and/or the method applied to limit the risk of bias (e.g., imputation or the removal of data). This would improve the quality of their studies and the interpretations thereof.
Finally, authors must report all necessary information. As has been noted, several of the studies did not state when they collected their data or the gender distribution of the participants. This is a significant omission because the studies included in the present review aimed to investigate children's functioning during a period that was punctuated by constant challenges and openings and closures. Scholars and clinicians must possess this information so they can more accurately assess the authors' findings. Given the existence of gender differences in internalizing and externalizing symptoms (Chen, 2010; Bender et al., 2012; Campbell et al., 2021), it is crucial that all authors clarify the composition of participants. Scholars must, therefore, apply strict methodological rigor to their studies. In sum, it is hoped that the above recommendations will be of benefit to future researchers, and subsequently, children and their parents.
Data availability statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Author contributions
Conceptualization of the methodology: AL and FL. Searched for the scientific literature, screened the records, and appraisal each paper according to the standardized protocol: AL and CM. Writing the draft: AL. Tabulated information of the papers: CM. Arbitrated any methodological disagreements: FL. Conceptualization of the topic: All authors. All authors critically revised the manuscript and agreed with its submission in the current form.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
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*^We marked with * the reviewed papers
Keywords: COVID-19, child, internalizing symptoms, externalizing symptoms, systematic mixed studies review, MMAT
Citation: Levante A, Martis C, Bianco F, Castelli I, Petrocchi S and Lecciso F (2023) Internalizing and externalizing symptoms in children during the COVID-19 pandemic: a systematic mixed studies review. Front. Psychol. 14:1182309. doi: 10.3389/fpsyg.2023.1182309
Received: 08 March 2023; Accepted: 02 May 2023;
Published: 15 June 2023.
Edited by:
Jane E. M. Callaghan, University of Stirling, United KingdomReviewed by:
Yolanda Flores-Peña, Autonomous University of Nuevo León, MexicoLoredana Cena, University of Brescia, Italy
Copyright © 2023 Levante, Martis, Bianco, Castelli, Petrocchi and Lecciso. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Serena Petrocchi, c2VyZW5hLnBldHJvY2NoaSYjeDAwMDQwO3VzaS5jaA==