Qing Ye, Wenxia Shao, Hanyan Meng
Performance and application evaluation of SARS-CoV-2 antigen assay
Journal of medical virology
describe patterns agerelated change selfreported physical activity domains within heterogeneous sample boys girls us transitioning elementary high school prospective cohort study participants included n 644 children recruited 5th grade 105 05 years old 45 female completed physical activity choices survey least twice 5 time points 5th 6th 7th 9th 11th grade participants selfreported physical activities categorized organized nonorganized activities comprehensive variable created product total number physical activities reported past 5 days number days spent activity total time spent activity descriptive statistics growth curve models controlling covariates total sample sex examined total organized nonorganized physical activities ages 10 17 significant age gender interaction p 005 time spent nonorganized physical activities specifically sexes similar patterns decline age 13 boys increased age 13 girls declined maintained contrast boys girls declined organized physical activities ages 10 17 p 0001 observed stark differences agerelated change organized nonorganized physical activities marked differences patterns nonorganized physical activities boys girls future research examine physical activity interventions consider age sex domainspecific physical activity options youth