supported by National Natural Science Foundation of China(81422040,81172685);Ministry of Education New Century Excellent Talents(NCET-13-0362);Shanghai Science and Technology Commission(12411950405,14441904004,13QH1401800);The fourth round of Three-Year Public Health Action Plan(2015–2017)(GWIV-36);Shanghai Municipal Education Commission(D1502);The Ministry of Science and Technology(2010CB535000)
Background:Designing a simple and accessible approach to age estimation in children and youth is a great challenge in the fields of sports and physical activity(PA).This study was designed to develop and validate a ph...