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ORIGINAL RESEARCH article

Front. Public Health, 26 August 2022
Sec. Digital Public Health

Housing safety and health academic and public opinion mining from 1945 to 2021: PRISMA, cluster analysis, and natural language processing approaches

\nNa Li,&#x;Na Li1,2Rita Yi Man Li&#x;Rita Yi Man Li3Qi Yao
Qi Yao4*Lingxi SongLingxi Song5Jirawan DeeprasertJirawan Deeprasert1
  • 1Rattanakosin International College of Creative Entrepreneurship, Rajamangala University of Technology Rattanakosin, Bangkok, Thailand
  • 2College of Computer Science and Information Engineering, Qilu Institute of Technology, Jinan, China
  • 3Sustainable Real Estate Research Center, Department of Economics and Finance, Hong Kong Shue Yan University, Hong Kong, Hong Kong SAR, China
  • 4School of Literature and Journalism, Chongqing Technology and Business University, Chongqing, China
  • 5Chakrabongse Bhuvanarth International Institute for Interdisciplinary Studies, Rajamangala University of Technology Tawan-Ok, Bangkok, Thailand

Housing safety and health problems threaten owners' and occupiers' safety and health. Nevertheless, there is no systematic review on this topic to the best of our knowledge. This study compared the academic and public opinions on housing safety and health and reviewed 982 research articles and 3,173 author works on housing safety and health published in the Web of Science Core Collection. PRISMA was used to filter the data, and natural language processing (NLP) was used to analyze emotions of the abstracts. Only 16 housing safety and health articles existed worldwide before 1998 but increased afterward. U.S. scholars published most research articles (30.76%). All top 10 most productive countries were developed countries, except China, which ranked second (16.01%). Only 25.9% of institutions have inter-institutional cooperation, and collaborators from the same institution produce most work. This study found that most abstracts were positive (n = 521), but abstracts with negative emotions attracted more citations. Despite many industries moving toward AI, housing safety and health research are exceptions as per articles published and Tweets. On the other hand, this study reviewed 8,257 Tweets to compare the focus of the public to academia. There were substantially more housing/residential safety (n = 8198) Tweets than housing health Tweets (n = 59), which is the opposite of academic research. Most Tweets about housing/residential safety were from the United Kingdom or Canada, while housing health hazards were from India. The main concern about housing safety per Twitter includes finance, people, and threats to housing safety. By contrast, people mainly concerned about costs of housing health issues, COVID, and air quality. In addition, most housing safety Tweets were neutral but positive dominated residential safety and health Tweets.

Introduction

Housing provides shelter for humans. The United Nations regard housing as a fundamental human right: people enjoy basic accommodation and the right to “adequate housing.” It includes legal security of tenure; availability of services, materials, and infrastructure; affordability; livability; accessibility; location; and cultural suitability (1). As the service life of housing increases, building structures, components, and equipment age gradually, and safety management becomes more complicated, threatening the personal and property safety of owners and users. Thus, there is a need for research that studies safety management for the existing buildings.

Researchers developed different conceptual models to connect various housing aspects (2), including safety and others, affecting people's health in recent decades (3). Some shed light on safety perception and disaster (4, 5), housing safety net (6), public administration (79), life environment (10), housing health, etc. Despite the significant differences between the academic research and the public opinions per previous research, none of the articles highlighted this topic to our knowledge, nor social media content analysis. This research attempts to fill this research gap, and the results contribute to academic research on housing safety and public health and provide a reference for future research directions in housing safety and health. A comparison between the two allows us to understand the differences better and offers a hint to design more impactful research in future. The results can also be generalized to other research areas.

This study reviewed housing safety from 1945 to 2021 and addressed the research changes over time, an international collaboration between authors, most productive universities, authors' affiliation, and research focus. It used bibliometrics to study the research focuses, reveal future research direction (11), and help readers understand the research on housing safety in various countries and the primary concerns. It will answer the research questions regarding whether housing safety and health research has attracted more attention in economically developed countries and regions. This study also utilized sentiment analysis methods to study the emotions of Twitter and academic writers. After that, we compare the focus of public opinion expressed on Twitter to academic results.

The research is structured as follows: the second section is the literature review. It reviews housing safety from different perspectives, social media, Twitter, and the differences between academia and the public. Section Research method data source details the research method, including PRISMA, cluster analysis in bibliometrics, and sentiment analysis in natural language processing. Section Results and discussion records the results of academic research on housing safety from five aspects, while section Twitter analysis states the public opinion mining results on Twitter. Most residential and housing Tweets came from Canada and the United Kingdom, respectively, while housing health hazards were from India. Finally, Conclusion concludes the study.

Literature review

Housing safety

Rapid urbanization and industrialization have degraded the ecological environment. It has significantly impacted people's lives and property safety (12). With an increase in income and education, people's requirements for living safety continue to increase, and people prefer to live in comfortable homes that are convenient and far from dangerous facilities. Ban and Chen (13) stated that many housing aging problems existed in Shanghai due to rapid urbanization. They investigated housing safety awareness in Shanghai and confirmed the safety status of the premises, asymmetric information, differences among housing users impact housing safety awareness. Husin et al. (14) investigated 24 low-cost houses' safety performance in Kuala Lumpur and residents' satisfaction. The results showed a significant relationship between safety performance and residents' satisfaction.

In recent years, disasters frequently occurred worldwide. Large-scale temporary housing was built after the disaster (15). As the temporary accommodation might be used for a few years, it is significant to ensure temporary housing safety. Among them, site safety and fire risk are the core issues of the safety performance of temporary houses. Hui (16) analyzed location safety and temporary dwellings' fire risk from a safety perspective. The post-disaster fire risk assessment model of temporary houses was established based on the site safety model.

Furthermore, to ensure the safe construction of temporary housing after the disaster, Hassanain et al. (17) proposed a fire safety ranking system (SH-FSRS) for student housing facilities and introduced the developed SH-FSRS through case studies, and suggested improving fire safety performance in these facilities. Dzolev et al. (18) studied the influence of fire load density on fire development with computer code. The fire load density of 120 three-bedroom family apartments in Novi Sad in Serbia was studied. According to their survey results, the fire load density of residential buildings and apartments in Serbia has doubled over the past 30 years. Fire safety has been affected due to an increase in energy released in the burning process. Due to various reasons like natural disasters hazards (4, 19), strengthening housing safety management and improving safety management and maintenance become essential (20).

Many housing safety studies mainly focused on technologies and risk management of housing safety (21). Yu and Fang (22) combined the risk management theory with building safety management, identifying and evaluating risks in buildings' life cycles and putting forward measures for various risk factors. In recent years, risk assessment has been applied in urbanization management including urban flood risk assessment (23), hydrological risk management (24), underground engineering safety risk assessment (25), and landslide challenge assessment during housing development (26); there are few studies on social risk management, especially residents' behavior. Shan et al. (27) put forward the risk management strategy of urban–rural conflict in urbanization in China. Yu et al. (28) developed a model to manage social risks in urban redevelopment projects demolition and investigated the relationship between social risks and stakeholders. A series of studies on residents' behavior based on a questionnaire survey and factor analysis were conducted, such as the influence of residents' collective behavior on housing safety management (29). Previous research on housing safety extends to various topics. Nevertheless, a systematic analysis of housing safety and health research on Twitter is absent, to the best of our knowledge.

Housing safety and health

Housing safety and health are environmental and social determinants of public health (30). Dunn et al. (31) considered capital construction a feature of research on a healthy social economy. Easterlow and Smith (32) believed that British families attach great importance to safety, linked with housing ownership, and expected to bring practical and psychological benefits. Baker et al. (33) proposed and described a housing insult index (IHI) to capture how housing affects health. There was a hierarchical correlation between housing insults and health in all outcome indicators. In Accra, Ghana, a preliminary study conducted by Arku et al. (34) found that housing conditions, demand, and residents' residence control became significant predictors of self-reported general and mental health status.

Gibson et al. (35) believed that housing and neighborhood conditions were critical social determinants of health. They found that there are three main ways that housing and neighborhood affect health and health inequality: (a) internal housing conditions, (b) regional characteristics, and (c) housing tenure.

For some authors, housing and neighborhood conditions that affect health can be classified into four categories: the unstable home's influence on health (rickety house). Second is the economic burden due to high-cost housing. The third is the impact of family conditions on health (safety and housing quality). Finally, impacts of community on health, including people's living environment and social characteristics (3). In complex housing and health, research methods also advocate continuous innovation.

Lawrence (36) thinks that the interdisciplinary approach highlights the difference between the biomedical model that adopts the explanation of housing and health symptoms and the holistic model that combines biological logic, culture, economy, politics, psychology, and social factors in a new way. Lawrence (37) explained the relevance of interdisciplinary contribution to a more comprehensive understanding of housing density and the complex relationship between housing conditions and health status.

Housing is an essential social determinant of health. Housing experience is significant for the health and wellbeing of vulnerable people such as refugees and asylum seekers. Ziersch et al. (38) interviewed 50 refugees and asylum seekers. The results showed that housing is critical to health and wellbeing. It impacted health through affordability, physical suitability of housing relative to conditions and layout, social aspects such as security and sense of belonging, and security of tenure. Arcury et al. (7) studied the safety, security, hygiene, and privacy of migrant workers' housing using data collected in 183 migrant workers' camps in eastern North Carolina in 2010. They found that migrant workers' housing was insufficient. Overall, 73.8% of the houses were damaged in structure, 52.7% of the homes were unsafe in indoor temperatures, 83.5% of residents feel that their property is unsafe, and 46.2% of the houses have no privacy for bathing or washing (7).

Bamzar (10) studied whether the indoor physical environment of the elderly affected their views on the use of space, falls, and safety. Hirayama (6) discussed the housing safety net system of Japan based on the policy changes. In his study, neoliberalism effectively combined with the traditional low-income housing policy to influence the housing of those at a disadvantage. Venable et al. (4) assessed their views on housing security by investigating more than 450 individuals in communities that received housing reconstruction assistance after Typhoon Yolanda in 2013. They analyzed how housing design factors, post-disaster planning elements, personal characteristics, types of risks, and exposures affected their safety perception. Venable et al. (5) identified families for understanding housing safety. It is suggested that the future post-disaster training plan includes discussing the loading of the housing, focusing on how the components work together, supporting the design and modifying the decision-making to improve housing performance.

Twitter

As the Internet continues to permeate every aspect of daily life, individuals increasingly share detailed information regarding many aspects of their lives online via social media like Twitter (39). As one of the most remarkable social media in the Web 2.0 era (40), Twitter will have 192 million daily active users by 2020. It has been fully integrated into everyday life, despite it sometimes discloses sensitive personal information (41). Apart from its frequent use for personal communication, the usage of Twitter for work is increasing. Twitter citations have been studied as part of the “scientometrics 2.0” project. Twitter substantially affects various fields as knowledge sharing is essential for knowledge management. Bibliometrics and scientometrics have not yet focused their research on Twitter, but the field is increasingly interested in quantifying scholarly activity on the web (42).

Scholars investigated how people used Twitter to share safety knowledge in recent years. For example, Yao et al. (40) analyzed Twitter data via content, sentiment, and social network analysis and confirmed Twitter as a valuable tool for sharing relevant knowledge and opinion analyses in construction safety issues. Song et al. (43) analyzed English and French Tweets related to “occupational safety” and investigated languaculture differences' influence on users' behaviors. However, to the best of our knowledge, research on housing safety and health knowledge issue on Twitter is absent.

Differences between academia and public

Academia has long been perceived as distant from the public and “real” life (44). The “ivory tower” has been used to describe the British academy for several decades and is a metaphor depicting both “outsideness” and the privileged positioning of academics in everyday life (45). Sever et al. (44) explored differences between how people with varying degrees of contact and first-hand experience of academia perceive academics. This had been done by taking three sample groups, those without a university education, students, and academics, across two contexts, Turkey and the United Kingdom, where the academy has a long and well-known history. Thus, two findings could be compared, contrasted, and analyzed: academics' roles and identities. After all, the public and students in both countries believed that academics are irrelevant to their daily life concerns away from the university and inaccessible people hidden in their ivory towers (44).

Ni et al. (46) collected more than 220,000 posts published by approximately 130,000 users regarding the #GeneEditedBabies event. Their results showed that although almost all experts opposed this event, many web-based posts supported it. To understand how self-control strategies helped reach financial goals, Davydenko et al. (47) conducted a meta-analysis to aggregate the latest research on self-control strategies in the financial domain and estimate their overall effectiveness for saving and spending outcomes. Their studies highlighted the academic, online media, and lay-person perspectives. These perspectives overlapped considerably, but there was a gap between what academic study and what people do in their daily lives. There was a more remarkable agreement between the online media and lay perspectives than the academic perspective, suggesting that individuals' personal spending habits followed online media recommendations, rather than academic findings.

Research method data source

Bibliometrics analysis

The bibliometric analysis provides an overview of a field of research (48). It studies the research that contributed to a body of knowledge (49), reveals the sources and development of knowledge, and visualizes the connection of knowledge structure in a figure (50). A scientific knowledge map has been a relatively new research method in informatics (50). Cluster analysis classifies elements according to their similarity (51). As cluster analysis efficiently presents the co-citation network based on the article citations and reveals the structure of a particular research field, it is broadly applied for bibliometric research.

Zupic and Cater (52) introduced bibliometrics methods, including citation analysis, co-citation analysis, bibliography coupling, co-author, and co-word analysis, and proposed a bibliometrics research workflow for researchers. Zhou et al. (53) conducted a bibliometric analysis of the articles published in the International Journal of Strategic Property Management from 2008 to 2019 in the Social Science Citation Index database on asset and facility management, property, risk management, residential property value promotion, and housing financing. Moghayedi et al. (54) systematically reviewed the critical success factor for implementing sustainable, innovative, affordable housing. Using a similar approach, Ramos-Rodriguez and Ruiz-Navarro (55) identified research that had the most significant impact on strategic management research and analyzed its changes over time.

Yin et al. (56) discussed the development status of open-source software building information modeling (BIM), revealed the integration between BIM and offsite construction, and determined the research trend based on 4,395 publications about BIM, 2,841 publications about offsite construction, and 113 publications on BIM for offsite construction in Scopus based on bibliometric-qualitative review method. Bibliometrics contributes to a systematic review of the existing studies, providing future research direction. Daim et al. (57) used bibliometrics research and other forecasting methods to forecast fuel cell technology, food technology, food safety technology, and optical storage technology. Using bibliometric analysis, Fahimnia et al. (11) identified the current research areas of interest and potential directions for future research in green supply chain management. They provided a robust roadmap for further analysis. Xia et al. (58) tested the hypothesis that the value of data for scientific investigators, in terms of the impact of the publications based on the data, decreases over time.

The construction of bibliometric maps receives the most attention in the bibliometric literature (59). This research used VOSviewer software (version of 1.6.16) for constructing and viewing bibliometric maps (59). As an essential analytical information visualization tool, VOSviewer can provide a scientific research perspective and accurately mine the research focuses (60). It can display a network of journals, researchers, keywords, and publications based on co-citation, coupling, and co-authorship and obtain visible results (61).

Natural language processing (NLP) was used to analyze the sentiment of the abstract. It provides a clustering function for two terms that appear simultaneously (62). After importing data, the minimum frequency of entries is set. Based on relationship strength and direction, different groups can be found by clustering, network, overlay, and density visualization.

By studying the size of keywords, we know the popularity of the research: significant word size indicates it occurs more frequently. Similarly, the scale of different organizations records their contributions in the field. Similar reasons apply to countries where these publications are published. For example, the structural distribution of research focuses is found through keyword co-occurrence, and the research community is found through author and organization collaboration. The color of an element represents the cluster it belongs to, and different clusters are represented by different colors (62).

Overlay visualization is different from network visualization as the color of overlay visualization has a gradual change effect. Overlay visualization adds a time factor to the visual analysis of objects (62). Different colors correspond to the year when the elements appear (62). Each point in density visualization has a color, indicating the density of elements at that point. By default, the colors range from blue to green to yellow. The more elements near to present, the closer the color to yellow. Works published later are in blue.

Sentiment analysis

Sentiment analysis is a process of analyzing, inducing, and subjective reasoning texts (40). It is a series of methods, techniques, and tools used to detect the semantics of personal inclination in language. It is the key to a deep semantic understanding of the text (63). Sentiment analysis is the core of text emotion analysis, which refers to the emotional judgment of the text containing personal information. Sentiment can be classified into two categories (positive, negative), three categories (positive, negative, neutral), and multiple categories (happy, excited, sad, angry, etc.) (63). Short-text sentiment analysis is one critical research area in natural language processing. The emotional tendency analysis of the short text can be summarized into text representation, feature extraction, model training, and result analysis (63).

In this study, MeaningCloud was used to investigate emotional content. MeaningCloud is a cloud-based text analysis service. Different APIs provide access to various natural language processing (NLP) tasks, such as automatic classification, sentiment analysis, and topic extraction (43). The API can extract information from unstructured content such as social interactions, articles, and documents (40). In addition, MeaningCloud is more accurate than similar NLP tools (64).

Data source

Web of Science is a large comprehensive, multidisciplinary, and core journal citation index database. It includes the Science Citation Index (SCI), Social Sciences Citation Index (SSCI), Arts and Humanities Citation Index (A&HCI), Current Chemical Reactions (CCR), Index Chemicus (IC), Science Citation Index Expanded (SCIE), Conference Proceedings Citation Index-Science (CPCI-S), and Conference Proceedings Citation Index-Social Science & Humanities (CPCI-SSH), with ISI Web of Knowledge as the retrieval platform (43).

The Web of Science Core Collection is selected as the data source in this study. According to Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) data (65), this study extracted original data (65), and 982 results were retained. It followed PRISMA guidelines for conducting systematic research reviews (66). Using keywords “housing safety,” “residential safety,” “intelligent home safety,” “sick house syndrome,” and “housing health hazard” to search for the documents in Web of Science, document details are then imported to Excel to sort, remove duplicate records, and delete documents that do not conform to the research topics and retrieval methods. After the aforementioned treatment, we obtained 1037 pieces of literature. The PRISMA process is presented in Figure 1.

FIGURE 1
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Figure 1. PRISMA for selecting relevant housing safety and health research indexed in WOS.

Results and discussion

Time development context

The number of articles published each year recorded the trend of publication in the field (Figure 2). It shows an upward trend in three stages. Web of Science covers the articles published since 1900, but we found no related articles from 1900 to 1944. Until 1945, Wilkins published the first article in the British Medical Journal about housing and health. The second stage is from 1945 to 1997. Only 16 published articles were retrieved in this stage, which shows that the research on housing safety is still in the infantry stage. The third stage is from 1998 until now, and the number of published articles accounts for 96% of the total number of articles, which shows housing safety and health research flourished. Since 1998, the number of articles has increased gradually. While the growth rate was relatively slow from 1998 to 2009, published works boomed after 2010.

FIGURE 2
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Figure 2. Annual number of published housing safety and health research articles (1945–2021).

International cooperation

The top 10 most productive countries are developed countries, except China, which ranked second (Figure 3). The United States has the most significant number of publications (n = 319), accounting for 30.76%. This proves that scholars' housing safety issue in the United States is now a remarkable concern. The number of articles published in China ranked second (n = 166), accounting for 16.01% of published works. Total citations in the United States reached 8,189, and the average cited frequency was 25.67, while the total cited frequency in China was 1,375, with an average citation of 8.28, that is, about one-third of articles written by U.S. authors. Although the number of articles published in China ranked second to the United States, the average number of cited articles is much lower than that in the United States.

FIGURE 3
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Figure 3. Number of articles published by the top 20 countries.

On the one hand, due to the late start of real estate-relevant research in China, the number of published articles is not considerable and so is the average citation. In future, Chinese housing safety researchers need to publish articles in top journals and improve the research quality. We speculate that the socialist system may influence housing safety and health issue in China.

Figure 4 shows the number of articles, cooperation, and influence among countries. The node size represents the number of articles, and the connection represents co-authorship. The core country represented by the blue cluster is the United States, and its principal research co-authors are from Canada, South Korea, Sweden, and India. China is the core country of the orange cluster, and Australia, Japan, France, and Spain are its main research partners. The core country in the purple cluster is Britain, and the collaborative countries in this cluster include New Zealand, the Netherlands, Scotland, and Brazil. France is the core country shown by the red cluster, and its collaborative countries include Spain and Sweden. The United States is the first country to conduct housing safety research, followed by Japan, but China has shown a significant growth trend in recent years. Although this research started later in China than in the United States, it developed rapidly. We can identify the United States and China as two representative countries. Other countries with apparent element density include Britain, Japan, Australia, and Canada.

FIGURE 4
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Figure 4. Network visualization analysis of international cooperation of housing safety research.

University with the largest number of publications

The University of California recorded the most significant publications (20 articles). The University of London in Britain ranked second (13 articles), the University of Michigan ranked third (12 articles), and Tsinghua University had nine publications, ranking eighth. According to VOSviewer statistics, 1,351 research institutions and 350 institutions jointly published two articles (≥2), accounting for 25.9% of the total cooperative institutions. It shows that inter-institutional cooperation, academic exchanges, and collaboration are not frequent. According to VOSviewer cluster analysis, as shown in Figure 5, there are six small clusters, and the clusters where blue, pink, and orange are located refer to American research institutions. The purple cluster represents Tsinghua University in China as the core. The red group mainly includes the University of Melbourne in Australia; the green cluster shows the close cooperation between the University of London and the National Taiwan University of Science and Technology.

FIGURE 5
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Figure 5. Network visualization analysis of issuing agency of housing safety research.

Authors' collaboration

According to VOSviewer authorship statistics, 3,173 authors have published articles on house safety. After data cleaning, the top 10 authors have been sorted out in Table 1. Table 1 shows that Evans, G.W. of Cornell University, is the author with the most significant number of articles (7), an H-index of 7, and the highest total cited frequency of 1,708 times. The article “The environment of poverty: multiple stress exposure, psychological stress, and social adjustment” published in 2002, was cited 647 times, thus most cited among all authors.

TABLE 1
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Table 1. Top 10 most published researchers on housing safety.

There are 186 core authors (scholars who have published more than or equal to two articles) in the housing safety study (N = 2.802) (67). By analyzing their published articles, we can effectively identify the development context of the field. According to Price's theory, N = 0.749(Nmax)12, there are three clusters. It shows close cooperation within clusters and less cooperation outside clusters. Nmax refers to the most significant number of articles, and N is the minimum number of articles published by core authors. Their cooperation relationship is shown in Figure 6. It reflects that geographical proximity favors cooperation as less cooperation across regions and disciplines.

FIGURE 6
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Figure 6. Co-author diagram of housing safety research articles based on VOSviewer.

It can be seen from Figure 6 that three clusters are green cluster with Ormandy, D.; the blue cluster with Howden-Chapman, P.; and the red cluster with Jacobs, D.E. The blue cluster cooperates closely with the green and red clusters, while the green and red clusters have less cooperation.

Research focuses

Most productive journals

The main categories of housing safety research in the Web of Science are engineering (28.9%), public environmental occupancy health (15.1%), environmental sciences and ecology (9.7%), and computer science (8.8%). These four categories account for 63%. By sorting the sources of publications, this study revealed that housing safety is mainly published in Safety Science (impact factor 6.392), followed by the American Journal of Public Health (impact factor 11.561), International Journal of Environmental Research and Public Health (impact factor 4.614), Habitat International (impact factor 5.205), Social Indicators Research (impact factor 2.935), Social Science and Medicine (impact factor 5.379) in 2021 Journal Citation Reports.

Bibliometrics and sentiment analysis

Using VOSviewer, this study makes a co-occurrence analysis of literature keywords related to housing safety research in the Web of Science Core Collection (Figure 7). It retrieved 1,037 pieces of literature and 127 keywords in six clusters. The higher the frequency of the keyword in the cluster, the larger the sphere in the co-occurrence figure, which also shows that the keyword is a research focus. However, since the same concept can be expressed in different keywords (such as housing safety and residential safety in Figure 7), the sphere size cannot wholly describe the situation. Therefore, a combination of similar keywords is essential for research focus analysis.

FIGURE 7
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Figure 7. Co-occurrence analysis of keywords.

The first cluster is the red cluster, which covers safety management-related issues based on 36 keywords, such as building safety, model, performance, management, and design. The second category is health-related green clusters. It covers 30 keywords, including health, risk, impact, and care. The third category is the deep blue cluster with 19 keywords, including housing, safety, government, policy, public health, and rights. The fourth category is the yellow cluster, containing 18 keywords, including children, exposure, formaldehyde, prevalence, sick building syndrome, and sick house syndrome. The fifth category is the purple cluster, which covers 17 keywords, including behavior, environment, migration, and quality. The sixth category is the light blue cluster, with seven keywords: asthma, built environment, crime, home, housing quality, inequalities, and substandard housing. There are more research keywords related to housing health than safety.

Housing safety research in developed countries such as the United States started earlier. Thus, more relevant research is based on various methods and means (68). By contrast, according to national policies and economic development, the number of publications in developing countries is usually less, and there is room for improvement in article quality. However, China is an exceptional case. Although the research on housing safety management in China started later than in the United States, it developed rapidly.

This study analyzed emotions of 982 abstracts. The sentiment distribution is shown in Figure 8. Strong positive, positive, neutral, negative, and strong negative are marked as 2, 1, 0, −1, and −2. Of all the abstracts, the number of strong positives was 11, positive was 521, neutral was 201, negative was 247, and strong negatives was 2, accounting for 1.12, 53.05, 20.47, 25.15, and 0.20%, respectively. The correlation between citations and sentiment is negative (−0.123), indicating that negative abstracts are linked with higher citations, and the average confidence level is 90.48%.

FIGURE 8
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Figure 8. Emotional distribution based on published literature abstracts.

Twitter analysis

To compare the focus of academia and the public, we studied Tweets in the second part of the research. From 24 January 2022 to 26 January 2022, it used “housing safety,” “residential safety,” “intelligent home safety,” “sick house syndrome,” and “housing health hazard” as keywords and obtained 8,257 results. “Intelligent home safety” and “sick house syndrome” had no result, “housing safety” had 7,513 Tweets, “residential safety” had 685 Tweets, and “housing health hazard” had 59 Tweets. Furthermore, this study analyzed the top opinion leaders for “housing safety,” “residential safety,” and “housing health hazard.” It also conducted a sentimental analysis of Tweets by MeaningCloud.

Regarding housing safety, this research found 7,513 Tweets. According to the in-degree centrality, the top 10 influencers are listed in the following table, out of which, eight were from the United Kingdom, and most came from the government or politics. This shows that the U.K. government's issue of housing safety has been widely concerned. This phenomenon shows that the U.K. government pays the most attention to sharing housing safety issues on Twitter (Table 2).

TABLE 2
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Table 2. Housing safety key opinion leaders in Twitter.

We then performed sentiment analysis. Among 7,513 Tweets, 406 were strongly positive, 1,997 were positive, 4,087 were neutral, 978 were negative, and 45 were strongly negative. More than half of the Tweets were neutral; people did not talk about housing safety with strong emotions. In addition, word cloud identified some main concerns together with housing safety. “Afford,” “claims,” and “invest” refer to the fact that these people are concerned about finance together with safety. They also linked housing safety issues together with “family,” “kid,” and “people.” Then, “medical,” “fire,” and “nutrition” showed that they are aware of the potential threats to housing safety (Figure 9).

FIGURE 9
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Figure 9. Most frequently mentioned words in housing safety.

Residential safety had 685 Tweets. Among 685 Tweets, 38 were strongly positive, 267 were positive, 101 were neutral, 273 were negative, and six were strongly negative. According to in-degree centrality, the top 10 influencers are listed in the table, of which four opinion leaders are from Canada, and three are government departments. Most opinion leaders are professional users such as government, fire, counselors, and professors, apart from one opinion leader (veganowak, the only individual key opinion leader) who did not state his personal information. It also shows that the professional users are the primary group communicating residential safety issues on Twitter (Table 3).

TABLE 3
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Table 3. Key opinion leaders of residential safety in Twitter.

According to the word cloud, the venue of residential safety Tweets centered on “home,” “road,” “street,” “city,” “farm,” and “community.” Second, “fire,” “car,” “flooding,” and “electric” showed frequent problems in residential safety (Figure 10). Finally, “owners” and “tenants” indicated that the stakeholders involved were house owners and tenants. There are 59 Tweets about housing health hazards. Among the top 10 key opinion leaders, six were from India, and four were government officials, which illustrates that Indians pay most attention to housing health hazard issues on Twitter. According to the in-degree centrality, the top 10 influencers are listed in the following table (Table 4).

FIGURE 10
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Figure 10. Most frequently mentioned words in residential safety Tweets.

TABLE 4
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Table 4. Key opinion leaders of residential safety Tweets.

The sentiment analysis showed that out of 59 Tweets, 48 are positive, and 11 are negative. Word cloud keywords “free,” “paid,” “pay,” and “availability” indicated that people pay attention to the cost of reducing housing health hazards. “Family” and “public” were the most concerned about housing health hazard. “Air,” “mask,” “isolation,” “COVID,” and “isolation” showed that this issue is related to air quality and COVID. “Standard” indicated that people are concerned about the standards regarding the housing health hazard (Figure 11).

FIGURE 11
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Figure 11. Most frequently mentioned words in housing hazard Tweets.

Conclusion

Based on the bibliometric and visual analysis of housing safety research from 1945 to 2021, this study included 982 housing safety research articles. Since 1998, the research on housing safety and health has attracted the attention of more scholars, and the number of published articles has increased rapidly, accounting for 96% of all published articles. The United States and China have published more research articles than other countries. The United States has published the most significant number of publications, accounting for 30.76%. The number of published articles in China ranked second, accounting for 16.01% of published articles. The University of California in the United States and the University of London in the United Kingdom are the research institutions that issue the most articles. According to the statistics, 1,351 research institutions published articles in these areas, but 350 institutions jointly published two articles (≥2), accounting for 25.9% of all institutions. It shows that there is not much inter-institutional collaboration in this research area.

The research on housing safety was mainly published in Safety Science, American Journal of Public Health, International Journal of Environmental Research and Public Health, Habitat International, etc. There were 186 core authors in the housing safety study in our research. Analyzing published articles shows close cooperation within clusters and less cooperation outside clusters. It reflects that geographical proximity favors collaboration as fewer co-authors collaborate across regions and disciplines.

As the first systematically bibliometrics analysis on housing safety and health issues, our research innovatively uses AI sentimental analysis on all abstracts. The natural language processing algorithm results found that most research article abstracts about housing safety were positive. The number of positive articles was 521, accounting for 53.05% of the total. Nevertheless, there is a negative relationship between citations and emotions (−0.123), meaning abstracts with negative emotions attracted more citations. Despite many industries moving toward AI-related research, housing safety and health research are exceptions and have become a research void.

In the second part of the research, this study reviewed 8,257 Tweets. Most residential and housing Tweets came from Canada and the United Kingdom, respectively, while housing health hazards were from India. There were much more housing/residential safety (n = 8,198) Tweets than those in health (n = 59), which is the opposite to the academic research. The main concern about housing safety on Twitter includes finance, people, and threats to housing safety. Twitter users are mainly concerned about the cost of housing health issues, COVID, and air quality. Despite some applications like drones for crack detection via computer vision, AI robots and facial recognition have been used in housing estates, similar to academia, there is a lack of discussions linking AI to housing safety and health.

Top 10 housing safety influencers on Twitter worked for the government or were politicians. This shows that the government is concerned about housing safety. The top 10 opinion leaders regarding residential safety include the government departments, fire departments, counselors, and professors. Among them, four opinion leaders were Indian government officials. We may conclude that many government officers utilized Twitter as a channel to share housing/residential safety and health issues with the public. Individuals seldom use Twitter to express their opinions on these issues, in any case. The research results contribute to scholarship by comparing academic and public perceptions of housing safety and health. At the same time, the research methods provide a reference for researchers who try to use online social media, especially those who wish to use natural language methods, to process online data. Government officials might consider adopting Twitter data to solicit people's opinions, rather than surveys or interviews, which take a long time, and the response rate might be low (69).

Data availability statement

The original contributions presented in the study are included in the article/supplementary material, further inquiries can be directed to the corresponding author/s.

Author contributions

NL and RL performed the study, analyzed data, and wrote the manuscript. LS and QY contributed obtaining and analyzing data. RL and JD designed the study. NL and LS analyzed data and wrote the manuscript. All authors contributed to the article and approved the submitted version.

Acknowledgments

The authors would like to thank reviewers for useful comments.

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

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: safety and health, natural language processing, social media, cluster analysis, PRISMA

Citation: Li N, Li RYM, Yao Q, Song L and Deeprasert J (2022) Housing safety and health academic and public opinion mining from 1945 to 2021: PRISMA, cluster analysis, and natural language processing approaches. Front. Public Health 10:902576. doi: 10.3389/fpubh.2022.902576

Received: 23 March 2022; Accepted: 25 July 2022;
Published: 26 August 2022.

Edited by:

Zhijun Yin, Vanderbilt University Medical Center, United States

Reviewed by:

Mengqi Li, Birmingham City University, United Kingdom
Miao Shi, Lyceum of the Philippines University, Philippines

Copyright © 2022 Li, Li, Yao, Song and Deeprasert. 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: Qi Yao, yaoqi@ctbu.edu.cn

These authors share first authorship

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.