Cumulative risk of death for LTOT 24 h/day (N = 539) versus 15–16 h/day (N = 1,231) in oxygen-dependent COPD.

<p>The hazard ratio was 0.98 (95% CI, 0.85 to 1.14); adjusted for baseline age, sex, oxygen dose, PaO₂ (air), PaCO₂ (air), FEV₁, WHO performance status, body mass index, treatment with oral glucocorticoids, and comorbid diagnoses including anxiety, renal failure and number of cardiovascular diagnoses.</p

Baseline characteristics in oxygen-dependent chronic obstructive pulmonary disease patients.

<p>Baseline characteristics in oxygen-dependent chronic obstructive pulmonary disease patients.</p