Prediction of mortality among patients with chronic kidney disease: A systematic review

Figure 1 Flowchart of the literature search and study selection. “Undesired study design” includes non-human studies (n = 2); “Insufficient data” includes conference abstracts that reported only area under the receiver operating characteristic curve (AUC) without 95% confidence interval (n = 5); “Subjects are contaminated” refers to a study that has mixed chronic kidney disease (CKD) and non-CKD subjects (n = 1).

Figure 2 Algorithm of study population classification. CKD: Chronic kidney disease; ESRD: End-stage renal disease; HD: Hemodialysis; N: Number of population classification; PD: Peritoneal dialysis.