Table 3.

Multiple regression analysis of factors associated with comorbid depressive symptoms in LBP.

Variable		Odds ratio	95% CI	p -value
Sex	Male	1.0	-	0.001
	Female	1.41	1.16–1.73
Age	45–59	1.0	-	<0.001
	60–74	0.72	0.63–0.83
	≥ 75	0.62	0.49–0.79
Regions	Eastern	1.0	-	<0.001
	Central	1.39	1.18–1.64
	Western	1.56	1.33–1.83
Duration of nighttime sleep	Normal	1.0	-	<0.001
	Short	1.54	1.33–1.78
	Extremely short	2.74	2.33–3.23
SRH	Good	1.0	-	<0.001
	Fair	1.49	1.21–1.84
	Poor	2.91	2.34–3.63
Multisite pain	No	1.0	-	0.001
	Yes	1.54	1.20–1.98
BADL disability	No	1.0	-	<0.001
	Yes	1.70	1.47–1.98
IADL disability	No	1.0	-	<0.001
	Yes	1.95	1.70–2.24