Table 4

 Predictors of mortality: multivariate analysis

Hazard ratio(adjusted)95% CIp value
BMI, body mass index; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; Pao2, Paco2, arterial oxygen and carbon dioxide tensions; Fio2, fractional inspired oxygen; LTOT, long term oxygen therapy.
Group A, no acute exacerbations of COPD; group B, 1–2 acute exacerbations of COPD (emergency visits or hospital admissions); group C, ⩾3 acute exacerbations of COPD.
Age (years)0.001
    65–741.920.64 to 5.25
    ⩾755.281.75 to 15.93
Charlson index0.101
    11.170.59 to 2.29
    ⩾22.231.06 to 4.69
BMI (kg/m2)0.960.89 to 1.030.245
FEV1 (% predicted)0.970.96 to 1.030.810
FVC (% predicted)0.970.97 to 1.020.695
Pao2/Fio21.000.99 to 1.010.374
Paco21.071.02 to 1.120.006
LTOT1.950.93 to 4.120.078
Exacerbation groups0.003
    Group AReference
    Group B2.001.01 to 3.98
    Group C4.131.80 to 9.45