There were four studies [17–20] carried out on peritoneal dialysis (PD) patients, as shown in Table 2, The value of serum PCT level to predict peritonitis in PD patients (DOR: 18.33; AUROC: 0.89) was substantially lower compared with that in all included patients (DOR: 61.52; AUROC: 0.94). Here, CALCA is linked to renal dialysis.