Risk factors for depression in patients with chronic obstructive pulmonary disease

Table 3 Multivariate logistic regression analysis of risk factors

Factors	β	OR	95%CI	P value
Duration of respiratory symptoms	0.002	1.002	0.999-1.004	NS
Exacerbation rate (prior yr)	0.13	1.139	0.854-1.518	NS
BMI (kg/m2)	-0.113	0.893	0.830-0.962	0.003
FEV1 (L)	-1.124	0.325	0.132-0.803	0.002
CAT score	0.105	1.111	1.021-1.209	0.004

β: Coefficient regression; OR: Odds ratio; CI: Confidence interval; BMI: Body mass index; FEV1: Forced expiratory volume in 1 s; CAT: Chronic obstructive pulmonary disease assessment test; NS: Not significant.