CST3 and kidney disorder: For CKD-EPI creatinine equation, the proportion of participants with prevalent renal disease in those with eGFR of <60, 60–75 and>75/mL/min/1.73 m2 were 0.9%, 0.6% and 1.9% respectively (χ2 3.01, p = 0.222), which was similar for CKD-EPI cystatin C and CKD-EPI creatinine-cystatin C equations.