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Table 3 Impact of evaluated variables on survival of COPD patients at the four stages according to Cox regression analysis (n = 193)

From: Retrospective survival in elderly COPD patients receiving pulmonary rehabilitation; a study including maintenance rehabilitation

  HR(95% CI) P-value
Age 1.05* (1.02 - 1.08) < 0.001
Sex 0.68** (0.44 - 1.05) 0.08
BMI (kg/m2) 0.98 (0.94 - 1.02) 0.32
PaO2 kPa (air) 0.85 (0.70 - 1.02) 0.09
PaCO2 kPa (air) 0.84 ( 0.64 - 1.09) 0.19
LTOT 2.33 (1.44 - 3.77) < 0.001
COPD GOLD stage   
  1 (FEV1 ≥ 80% predicted) 1.0 (ref.)  
  2 (FEV1 50–80% predicted) 1.90 (0.57 - 6.35) 0.30
  3 (FEV1 30–50% predicted) 3.41 (1.30 - 11.25) 0.04
  4 (FEV1 < 30% predicted) 1.84 (0.47 - 7.14) 0.38
  1. Abbreviations see Tables 1 and 3.
  2. The variables were mutually adjusted for all other variables in the table.
  3. *5 years; **Male served as reference.