Table 3.

Results of Cox proportional hazards model comparing mortality in patients with severe COPD with relative lymphocyte count ≤20%

Variable	Hazard ratio for relative lymphocytes count ≤20% (95% CI)	p-value
Adjusted for age and sex	1.81 (1.27–2.59)	0.0012
Adjusted for age, sex, smoking, body mass index, FEV1 (percent of predicted)	1.79 (1.22–2.62)	0.003
Adjusted for age, sex, smoking, body mass index, FEV1 (percent of predicted), FVC (percent of predicted), FEV1/FVC (percent), PaO2, PaCO2, pH, ischemic heart disease, history of myocardial infarction, congestive heart failure, heart rate, systolic and diastolic blood pressure.	1.56 (1.02–2.38)	0.04

COPD chronic obstructive pulmonary disease, CI confidence interval, FEV₁ forced expiratory volume in one second, FVC forced vital capacity, FEV₁/FVC Tiffeneau, PaO₂ partial arterial oxygen tension, PaCO₂ partial arterial carbon dioxide tension