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Kaplan-Meier event-free survival curve. Kaplan-Meier analysis of MACE based on quartiles of serum cystatin C level in ACS patients after PCI (log-rank, P=0.003). Quartiles of serum cystatin C: Q1 ≤0.84 mg/L; 0.84< Q2 ≤0.96 mg/L; 0.96< Q3 ≤1.12 mg/L; Q4 >1.12 mg/L. MACE: a major adverse cardiovascular event, is defined as the need for repeat revascularization in the heart. CI, confidence interval; ACS, acute coronary syndrome; PCI, percutaneous coronary intervention.
