AUTHOR=Sun Mengmeng , Lu Yuxing , Yang Xi , Mao Xiaogang TITLE=Association between relative fat mass and sterility in women of reproductive age in the United States: results from the 2013–2018 NHANES JOURNAL=Frontiers in Endocrinology VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1521247 DOI=10.3389/fendo.2025.1521247 ISSN=1664-2392