The baseline charcteristics of all qualified studies included in the meta-analysis.

ACEI: angiotensin-converting enzyme inhibitor; ARB: angiotensin receptor blocker; RCT: randomized controlled trial; eGFR: estimated glomerular filtration rate; CKD: chronic kidney disease; DM: diabetes mellitus; Scr: serum creatinine; ESRD: end-stage renal disease; CIN: contrast-induced nephropathy; CI-AKI: contrast-induced acute kidney injury; ΔScr: an increase in serum creatinine from a baseline value; a: not mentioned;
The baseline charcteristics of all qualified studies included in the meta-analysis.