CAD patients were subdivided in quartiles according to cystatin C plasma concentrations, that is, Q1 < 0.88 mg/L (161 cases); Q2 = 0.88–1.09 mg/L (172 cases); Q3 = 1.09–1.29 mg/L (178 cases); Q4≥1.29 mg/L (171 cases). Here, CST3 is linked to coronary artery disorder.