Kaplan-Meier survival curves for nonhypercapnic patients (type 1), reversible hypercapnics (type 2.1), and chronic hypercapnic patients (type 2.2). Survival among type 2.2 patients was significantly worse (P<0.05) by the Cox-Mantel test) than the other two groups. Percentages refer to proportion of patients who survived 5 years.
Redrawn from Costello, R, Deegan, P, Fitzpatrick, M, McNicholas, WT, Am J Med 1997; 103:239.
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