Table 3.

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

	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

Abbreviations see Tables 1 and 3.

The variables were mutually adjusted for all other variables in the table.

*5 years; **Male served as reference.