Fig. 2

Receive operating characteristic (ROC) curve of the CRONICAS-CKD risk score for undiagnosed CKD using CRONICAS database. (a) complete risk score, the 95% CI of the area under the ROC curve is 79.6%-88.0%; (b) laboratory-free risk score, the 95% CI of the area under the ROC curve is 77.7%-86.8%. The areas between these curves were different (P = 0.028)