Identification of male COPD patients with exertional hypoxemia who may benefit from long-term oxygen therapy.

Despite their higher baseline BODE scores, unadjusted survival appeared to be higher at most time points in the responder group in a Kaplan-Meier analysis ( Fig 2A ), but this difference did not reach statistical significance using a log-rank test (χ 2 3.33; p = 0.068).

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