Figure 3
From: Plasma YKL-40 and all-cause mortality in patients with chronic obstructive pulmonary disease
Kaplan-Meier survival curves showing the association between plasma YKL-40 and 10 year OS in patients with different degree of disease severity. Patients were dichotomized according to the 75th percentile of plasma YKL-40 in age-matched healthy subjects. Patients were divided into groups with moderate COPD (A), severe (B) and very severe COPD (C). P-value refers to the log-rank test for equality of strata.