Ziyan Zhang, Qiongyin Hu, Chunyan Xu, Jianmin Zhou, Junhong Li
Medical teachers' affective domain teaching dilemma and path exploration: a cross-sectional study
BMC medical education
study aims describe time trend age menarche brazilian schoolgirls evaluated 2007 20122013 20182019 assess association overweight including obesity socioeconomic conditions three crosssectional studies carried 2007 20122013 20182019 schoolchildren enrolled second ninth years elementary school comprising 838 688 326 schoolgirls respectively body mass index z scores calculated categorised either without overweight overweight including obesity type school proxy socioeconomic condition categorised either public private menarche data collected using status quo recall methods mean age menarche estimated survival analysis differences age menarche according year survey weight status type school verified logrank test coxs univariate multiple regression increase prevalence overweight girls throughout surveys 214 2007 272 2012 285 2018 p 0007 overweight decrease mean age menarche 2007 20182019 123 vs 119 years respectively mean age menarche girls overweight lower three time periods compared girls without overweight 119 118 115 vs 124 124 121 respectively girls overweight likely earlier age menarche girls without overweight hazard ratio 157 95 ci 136 180 differences age menarche according type school increase prevalence girls overweight including obesity may associated age menarche girls overweight higher risk earlier age menarche girls without overweight