Multinomial logistic regression analyses with complex sampling of sleep time for internet using time for leisure and study (Reference = internet use for leisure, 0 h; internet use for study, 0 h).

Multinomial logistic regression analyses with complex sampling of sleep time for internet using time for leisure and study (Reference = internet use for leisure, 0 h; internet use for study, 0 h).针对睡眠时间与休闲、学习场景下的互联网使用时长，采用复杂抽样设计开展多项逻辑回归（Multinomial Logistic Regression）分析，参照组设定为：休闲用途互联网使用时长为0小时，学习用途互联网使用时长为0小时。