The objectives of this study were to (i) compare the strength of associations between sleep duration and body mass index (BMI) in middle childhood, and early and late adolescence; (ii) determine whether sleep duration in middle childhood predicts BMI in early or late adolescence; and (iii) examine the consistency of these associations by sex.

中文翻译：

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8-19 岁青少年的睡眠时间和 BMI 之间的关系因年龄和性别而异。


本研究的目的是 (i) 比较儿童中期、青春期早期和晚期的睡眠持续时间与体重指数 (BMI) 之间的关联强度； (ii) 确定童年中期的睡眠时间是否可以预测青春期早期或晚期的体重指数； (iii) 按性别检查这些关联的一致性。