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Kaplan-Meier curves for cardiovascular event-free survival by quartile (Q1–Q4) of plasma neutrophil gelatinase-associated lipocalin level. A clear difference among quartiles is evident. Quartile 1 (Q1): ≤60 ng/mL, quartile 2 (Q2): 61–104 ng/mL, quartile 3 (Q3): 105–193 ng/mL, and quartile 4 (Q4): ≥194 ng/mL.
