TABLE 2

Adjusted hazard ratios with 95% confidence intervals calculated in a Cox regression model for all-cause mortality after 5 years of follow-up among chronic obstructive pulmonary disease (COPD) patients in the Bergen COPD Cohort Study

Hazard ratio (95% CI)p-value
Desaturation during 6MWT
 No1
 Yes2.5 (1.1–5.3)0.02
Sex
 Female1
 Male1.3 (0.5–3.3)0.49
Age per 10-year increase1.7 (0.97–2.9)0.06
Body composition
 Normal1
 Cachectic2.7 (1.1–6.9)0.03
 Obese4.2 (1.2–14.4)0.02
Smoking habits
 Ex-smoker1
 Daily smoker1.1 (0.5–2.1)0.88
FEV1 % pred per 10% reduction0.99 (0.7–1.3)0.97
Exacerbations in 12 months before inclusion in study
 No1
 Yes0.8 (0.4–1.9)0.68
PaO2 at baseline per kPa increase0.9 (0.7–1.3)0.57
Charlson comorbidity score
 11
 20.8 (0.3–1.8)0.55
 30.9 (0.4–2.1)0.76
 ≥44.2 (1.4–13.0)0.01
6MWD per 10-m increase0.93 (0.9–0.96)<0.001
Height per cm increase1.05 (0.98–1.1)0.14
Weight per kg increase0.96 (0.92–0.99)0.02
  • 6MWT: 6-min walk test; FEV1: forced expiratory volume in 1 s; PaO2: arterial oxygen tension; 6MWD: 6-min walking distance.