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Kaplan–Meier survival estimates of death from serum YKL-40 in octogenarians. Patients were divided by tertiles of serum YKL-40. Low serum YKL-40 (≤ 80 μg/l, n = 50, 12 deaths), versus medium serum YKL-40 (> 80 μg/l and ≤ 140 μg/l, n = 51, 14 deaths) versus high serum YKL-40 (> 140 μg/l, n = 50, 25 deaths).
