3.2. Correlating factors of sleep duration by univariate logistical
analyses
The unadjusted OR with 95% CI of possible risk factors for sleep
duration less than 8.0 h on weekdays and on weekends are shown in Supplementary Table S2. Almost all factors were statistically significant
in the univariate regression models.
3.3. Correlating factors of sleep duration by multivariate regression
analyses
3.3.1. Demographic characteristics, and family structure and
socio-economic status
After controlling all potential factors, age, gender, and class type
were found to be significantly associated with sleep duration <8.0 h
on weekdays (Supplementary Table S3). For sleep duration on weekends,
age and class type were independent influential factors.
3.3.2. Biological/psychosocial conditions, and family history of sleep
disorders
The association of sleep duration on weekdays with biological/
psychosocial conditions and family history is presented in Table 1.
After adjusting only for demographic and socio-economic characteristics,
six factors (chronic pain, history of ADHD diagnosis, bedtime
anxiety, bedtime excitement/depression, parents’ and grandparents’
history of sleep disorders) were significantly associated with
an increased likelihood of shorter sleep duration (model I). After
further adjusting for biological/psychosocial conditions and family
history of sleep disorders, three factors (chronic pain, bedtime
anxiety, and parents’ history of sleep disorders) remained statistically
significant (model II). The associations were not found to be
changed after adjusting for environmental and behavioral variables
simultaneously (model III).
The association of weekend sleep duration with biological/
psychosocial conditions and family history is demonstrated in Table 1.
After controlling for all factors simultaneously, the full model indicated
that overweight/obesity, bedtime anxiety, and bedtime
excitement/depression were independent risk factors
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