AUTHOR=Li Haiyan , Tan Hongxia , OuYang Zhenbo , Hu Xianyue , Bao Yanjing , Gao Tianyang , Hua Wenfeng TITLE=Association between METS-IR and female infertility: a cross-sectional study of NHANES 2013–2018 JOURNAL=Frontiers in Nutrition VOLUME=12 YEAR=2025 URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2025.1549525 DOI=10.3389/fnut.2025.1549525 ISSN=2296-861X