Table 5.

Regression analysis of cardiopulmonary exercise testing variables associated with survival, adjusted for age and sex

Variable	Hazard ratio	95% CI	p-value
FEV1	0.593	0.353–0.996	0.048
FEV1/FVC	0.967	0.942–0.994	0.015
Work at peak V̇O2	0.980	0.970–0.991	<0.001
Peak V̇O2	0.925	0.851–1.006	0.069
O2 pulse at peak V̇O2	0.893	0.787–1.013	0.078
V̇E/V̇CO2 at AT	1.042	1.017–1.067	0.001
Peak V̇O2 <15ml/kg/min	1.339	0.786–2.280	0.283
V̇E/V̇CO2 >42ml/kg/min	1.885	1.128–3.151	0.016

AT = anaerobic threshold; CI = confidence interval; FEV₁ = forced expiratory volume in one second; FVC = forced vital capacity; V̇E/V̇CO₂ = ventilatory equivalent for carbon dioxide; V̇O₂ = oxygen consumption