Avigdor Klingman, examined 203 students from 7th to 12th grade in four different schools in northern Israel who participate in high school sports leagues.

• AvigdorKlingman主导的研究，调查了Israel北部的四间不同学校的从七年级到十二年级的203个学生。这些学生都参加中学的运动联盟。