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Median age at spermarche was determined using probit analysis. Logistic regression was used to assess the association of spermarche with <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Age at spermarche among <jats:styled-content style=\"fixed-case\">C<\/jats:styled-content>hinese boys dropped from 14.57 to 14.03 years from 1995 to 2010 with a decrease of 4.3 months per decade. Boys with <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>\u2010for\u2010age <jats:italic>z<\/jats:italic>\u2010score lower than \u22122 had the latest age at spermarche. A higher <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content> or <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>\u2010for\u2010age <jats:italic>z<\/jats:italic>\u2010score was associated with an increased likelihood of having reached spermarche, and this association was consistently observed at all survey points.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This study provides important evidence of a secular trend of earlier age at spermarche over the past 15 years in <jats:styled-content style=\"fixed-case\">C<\/jats:styled-content>hina, and this decrease was accompanied by a simultaneous increase in <jats:styled-content style=\"fixed-case\">BMI<\/jats:styled-content>. Strategies and interventions focusing on thinness may promote both their nutritional status and puberty development among <jats:styled-content style=\"fixed-case\">C<\/jats:styled-content>hinese boys.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ijpo.12073","type":"journal-article","created":{"date-parts":[[2015,9,25]],"date-time":"2015-09-25T10:25:12Z","timestamp":1443176712000},"page":"369-374","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Age at spermarche: 15\u2010year trend and its association with body mass index in <scp>C<\/scp>hinese school\u2010aged boys"],"prefix":"10.1111","volume":"11","author":[{"given":"Y.","family":"Song","sequence":"first","affiliation":[{"name":"Institute of Child and Adolescent Health School of Public Health Peking University  Beijing China"},{"name":"Social Medicine and Global Health Department of Clinical Sciences Lund University  Malm\u00f6 Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Ma","sequence":"additional","affiliation":[{"name":"Institute of Child and Adolescent Health School of Public Health Peking University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H.\u2010J.","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Child and Adolescent Health School of Public Health Peking University  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Z.","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Child and Adolescent Health School of Public Health Peking University  Beijing China"},{"name":"Centre for Chronic Disease School of Medicine University of Queensland Health Sciences Building Royal Brisbane and Women's Hospital  Herston Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P. 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