The sample characteristics by groups at baseline (2007) and follow-up (2009) in the intervention trial (mean±SD unless indicated).
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SD: sleep duration; Family income was expressed in RMB(yuan)/person/month. aAnalysis of Variance, ANOVA. bChi-square Test. *p<0.05. **p<0.01. ***p<0.001.
创建时间：
2013-07-10
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