Table 7.

Results of logistic regression analysis of ST duration and timing

		Obesity		Physical activity	Dry eyes	Learning ability
		BMI percentiles	Rohrer index	Weekly physical activityb	Dry eyes	Class	Performance
		ORa	ORa	ORa	ORa	ORa	ORa
		95%Cl	95%Cl	95%Cl	95%Cl	95%Cl	95%Cl
Duration of ST	Above 3 h	1	1	1	1	1	1
	1-3 h	0.61***	0.65***	1.19*	1.15	2.24***	1.67***
		0.50–0.74	0.52–0.81	1.03–1.37	0.97–1.36	1.71–2.94	1.41–1.98
	Less than 1 h	0.42***	0.43***	1.27**	1.19	3.93***	2.4***
		0.33–0.54	0.32–0.57	1.08–1.48	0.98–1.45	2.70–5.71	1.95–2.96
Timing of STc	No/(Yes)	0.78**	0.73**	1.06	1.31***	1.43**	1.55***
		0.65–0.93	0.60–0.90	0.95–1.17	1.15–1.50	1.10–1.86	1.33–1.79

^***p < 0.001, ^**p < 0.01, ^*p < 0.05

^aOR odds ratio, 95% CI 95% confidence interval

^bThe median number of physical activities per week was divided into two

^cWhether there was ST just before bedtime