Sleep environments and school schedules
The association between sleep duration on weekdays and sleep
environments and school schedules is given in Table 2. After adjusting
only for demographic and socioeconomic 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