Table 3.

Hazard ratios from univariable Cox regression analyses of baseline characteristics predicting death

Variable	Hazard ratio	95% CI lower limit	95% CI upper limit	P-value
Male sex	1.14	0.19	6.88	0.89
Age, years	1.06	0.96	1.17	0.26
Body mass, kg	0.94	0.88	1.01	0.11
BMI, kg/m2	0.89	0.73	1.08	0.23
Smoking status	0.53	0.10	2.75	0.45
Cigarette package years	1.00	0.98	1.03	0.85
FEV1	0.19	0.00	11.64	0.43
FEV1 % predicted	0.98	0.90	1.08	0.71
Estimated VO2 max, mL/min/kg	0.85	0.57	1.28	0.45
Oxygen sat, at rest	0.93	0.55	1.56	0.78
Oxygen supplement, yes	2.53	0.81	7.95	0.11
CAT	0.97	0.84	1.11	0.64
Number of previous exacerbations	1.20	0.89	1.62	0.24
MRC	2.59	0.67	10.00	0.17
COPD stage (GOLD)	1.44	0.30	6.99	0.66
Comorbid cardiovascular disease	2.72	0.45	16.32	0.27
Comorbid diabetes	1.13	0.38	3.38	0.83
Number of hospitalizations from rehabilitation end +18 months	1.17	0.85	1.62	0.34

Abbreviations: BMI, body mass index; CAT, COPD assessment test; CI, confidence interval; COPD, chronic obstructive pulmonary disease; FEV₁, forced expiratory volume in 1 second; GOLD, Global Initiative for Chronic Obstructive Lung Disease; MRC, Medical Research Council.