3.3.3. Sleep environments and school schedules The association between sleep duration on weekdays and sleepenvironments and school schedules is given in Table 2. After adjusting only for demographic and socio-economic characteristics, three factors (bedroom intrusive sound, more time spent on homework on weekdays and on weekends) were significantly related to an increased likelihood of shorter sleep duration (model I). After controlling simultaneously for sleep environments and school schedules, except for more time on homework on weekends, two other factors remained statistically significant (model II). After adjusting further for all health problems, family history, and behavioral variables, only more time on homework on weekdays remained as risk factors for shorter sleep duration (model III). For sleep duration <8.0 h on weekends, bed/room sharing, school starting time earlier than 07:00, and cram school learning were found to be significant in the full model.
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