CST3 and diabetes mellitus: Univariate Cox regression analysis identified several variables associated with renal recovery, including diabetes, cystatin C, uTIMP‐2•IGFBP7 ≥ 14.30 (mg/g Cr)2/1000, uDcR2 ≥ 378 ng/gCr, acute injury, chronic injury and total pathological scores (Table S6).