Table 5. Multiple logistic regression analysis to determine the factors identifying participants with poor sleep quality.

	Model 1 (n = 9,611)			Model 2 (n = 8,589)			Model 3 (n = 9,098)
	odds ratio	95% CI	P	odds ratio	95% CI	p	odds ratio	95% CI	p
Male	0.96	0.83–1.11	0.56	0.99	0.84–1.16	0.88	0.96	0.82–1.11	0.56
Age (y)	1.01	1.01–1.02	<0.01	1.01	1.01–1.02	<0.01	1.01	1.01–1.01	<0.01
Body mass index (kg/m2)	0.98	0.96–0.99	0.04	0.97	0.95–0.99	<0.01	0.98	0.96–0.99	0.03
Current smoker	0.88	0.74–1.05	0.18	0.81	0.66–0.99	0.04	0.93	0.78–1.11	0.42
Frequent alcohol drinker	0.93	0.80–1.08	0.34	0.95	0.80–1.12	0.54	0.98	0.83–1.14	0.78
Irregular sleep schedule	1.92	1.63–2.27	<0.01	-	-	-	1.98	1.67–2.34	<0.01
Hypnotic drugs	11.30	9.22–13.92	<0.01	12.00	9.68–15.01	<0.01	-	-	-
Analgesics	1.24	0.93–1.64	0.14	1.25	0.91–1.69	0.17	1.28	0.94–1.74	0.11
Gastroesophageal reflux disease	1.86	1.64–2.11	<0.01	1.84	1.61–2.12	<0.01	1.86	1.63–2.11	<0.01
No. unfavorable dietary behaviors	1.15	1.08–1.23	<0.01	1.19	1.11–1.28	<0.01	1.16	1.09–1.24	<0.01
Knee pain	1.22	1.08–1.39	<0.01	1.27	1.10–1.46	<0.01	1.22	1.07–1.40	<0.01
Low back pain	1.57	1.39–1.76	<0.01	1.60	1.40–1.82	<0.01	1.58	1.39–1.78	<0.01

Model 1: Analysis including all subjects.

Model 2: Analysis including only participants without irregular sleep schedule.

Model 3: Analysis including only participants who did not take hypnotics drugs.