Prognostic factors in COPD patients When analysing the data of COPD separately (n = 98), FEV 1 (75 th percentile 1.04 L, p < 0.012), BMI (75 th percentile 33.9 kg/m 2 , p < 0.009) but neither SRI subdomains nor SRI-SS were associated with survival; also leukocyte number did not reach statistical significance (median 9.6 *10 3 /μL, p = 0.059).
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Health-related quality of life and long-term prognosis in chronic hypercapnic respiratory failure: a prospective survival analysis.
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