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Table 3 Cox analysis of independent prognostic factors for all chronic obstructive pulmonary disease (COPD) patients

From: Predictors of exacerbation frequency in chronic obstructive pulmonary disease

Items B Wald Sig. RR 95.0% CI for RR
Lower Upper
Exacerbation frequency 0.418 11.868 0.001 1.518 1.197 1.926
FEV1% predicted -0.015 4.412 0.036 0.985 0.972 0.999
Charlson Index 0.201 7.311 0.007 1.222 1.057 1.413
Age 0.034 4.147 0.042 1.035 1.001 1.070
NPPV -0.664 8.578 0.003 0.515 0.330 0.803
PaCO2 0.022 4.373 0.037 1.023 1.001 1.044
Cor pulmonale 0.390 3.988 0.046 1.477 1.007 2.165
BMI -0.087 11.383 0.001 0.917 0.872 0.964
Total comorbidities -0.297 7.790 0.005 0.743 0.603 0.915
  1. RR, relative risk; FEV1, forced expiratory volume in one second; NPPV, non-invasive positive pressure ventilation; PaCO2, arterial carbon dioxide tension; BMI, body mass index.