该研究在《儿科学期刊》上发表。研究人员于2003年至2007年间对南北美洲、亚洲、欧洲和中东地区年龄在13岁到15岁之间的72845名学生进行了调查。
The researchers defined adequate physical activity as at least an hour of exercise outside of gym class at least five days a week.
研究人员将“充足的身体锻炼”定义为每周至少锻炼五天，每天至少进行一小时的户外锻炼。
Children who spent three or more hours a day watching TV, playing computer games, or chatting with friends -- aside from time in school or time spent doing homework -- were classified as sedentary.
除了在学校或做作业的时间外，每天看电视、玩电脑游戏或和上网聊天的时间超过三小时的孩子被定义为”惯于久坐”。