Table 4.

Unadjusted and adjusted model for respiratory failure based on STS COPD severity

Respiratory failure	Unadjusted				Adjusted
	OR	95% CI for Exp (B)		P	OR	95% CI for Exp (B)		P
		Lower	Upper			Lower	Upper
COPD severity				0.057				0.059
Mild vs. control	1.872	1.112	3.150	0.018	1.982	1.142	3.440	0.015
Moderate vs. control	1.860	0.998	3.467	0.051	1.855	0.970	3.548	0.062
Severe vs. control	1.707	0.866	3.365	0.122	1.772	0.871	3.605	0.114

OR: Odds ratio, CI: Confidence interval, COPD: Chronic obstructive pulmonary disease, STS: Society of Thoracic Surgeons, GOLD: Global Initiative for Chronic Obstructive Lung Disease