Table. 3—

Multivariate Cox proportional hazards analysis for multiple independent parameters associated with mortality

VariablesRelative risk95% CIp-value
Age yrs0.9790.897–1.068ns
Duration of disease yrs1.1581.059–1.2680.001
Smoke load pack-yrs1.0020.993–1.011ns
Duration hospital stay days0.5350.446–0.665ns
Albumin g·dL−10.4110.205–0.8240.012
FEV1 % predicted1.0320.967–1.102ns
FEV1/FVC %0.9920.960–1.025ns
Pa,O2 mmHg0.8710.784–0.9690.011
Pa,CO2 mmHg1.0380.987–1.091ns
Ppa mmHg0.9460.865–1.033ns
BMI kg·m−20.8300.703–0.9790.027
Comorbidity index0.7070.603–0.815ns
  • CI: confidence interval; FEV1: forced expiratory volume in one second; FVC: forced vital capacity; Pa,O2: arterial oxygen tension; Pa,CO2: carbon dioxide arterial tension; Ppa: systolic pulmonary artery pressure; BMI: body mass index; ns: not significant. kPa = mmHg×0.133.