Figure 2
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. Patients were dichotomized according to 75th percentile of plasma YKL-40 in age-matched healthy subjects (A), COPD severity (B), and 40 pack years (C). P-value refers to the log-rank test for equality of strata. Moderate COPD (79–50 FEV1 % predicted), severe COPD (30–50 FEV1 % predicted) and very severe COPD (< 30 FEV1 % predicted).