COPD Assessment Test (CAT) score as a predictor of major depression among subjects with chronic obstructive pulmonary disease and mild hypoxemia: a case–control study

Table 3 Multivariate logistic regression analysis assessing predictive value of Beck Depression Inventory or COPD Assessment Test adjusting for sleep parameters

Variables	Adjusted OR	CI 95%	p
Beck Depression Inventory	1.24	1.11 - 1.39	<0.0001*
Sleep stage II (% of TST)	1.07	0.99 - 1.16	0.08
REM Sleep stage (% of TST)	1.01	0.89 - 1.16	0.22
COPD Assessment Test	1.17	1.06 - 1.30	0.002*
Sleep stage II (% of TST)	1.07	1.00 - 1.15	0.06
REM Sleep stage (% of TST)	0.97	0.87 - 1.07	0.51

CI: confidence interval. OR: odds ratio. TST: total sleep time. *Statistically significant difference.

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