Summary of academic performance, media use, BMI z-score and SDQ total score amongst n = 1239 children, stratified by school year level.

Summary of academic performance, media use, BMI z-score and SDQ total score amongst n = 1239 children, stratified by school year level.本数据集汇总了1239名儿童的学术表现、媒体使用情况、BMI z评分（BMI z-score）与长处与困难问卷（Strengths and Difficulties Questionnaire，SDQ）总分，并依据学年层级对数据进行了分层统计。