Table 2.

Analysis of risk factors for CSAKI in entire cohort.

Variables	Unadjusted			Adjusted
	OR	95% CI	P	OR	95% CI	P
Male	1.596	1.375–1.852	< 0.001	2.127	1.759–2.571	< 0.001
Age [years]	1.030	1.024–1.037	< 0.001	1.033	1.024–1.042	< 0.001
Hypertension	1.288	1.108–1.497	< 0.001
NYHA classification 3–4	1.407	1.215–1.629	< 0.001	1.214	1.002–1.471	0.048
Elevated RDW (%)	1.335	1.232–1.447	< 0.001	1.108	1.005–1.222	0.039
eGFR < 60 mL/min/1.73 m2	2.399	1.851–3.108	< 0.001	1.602	1.124–2.284	0.009
Valve + CABG	2.752	2.001–3.784	< 0.001
CPB time > 120 min	2.134	1.752–2.599	< 0.001	1.919	1.553–2.372	< 0.001
Erythrocyte transfusion [U]*	1.340	1.243–1.445	< 0.001	1.167	1.056–1.289	0.002

^*The amount of erythrocyte transfusion refers to the total amount of erythrocyte transfusion for each patient received on the day of surgery.

CABG —coronary artery bypass grafting; CI — confidence interval; CSAKI — cardiac surgery associated acute kidney injury; CPB — cardiopulmonary bypass; eGFR — estimated glomerular filtration rate, calculated by CKD-EPI formulae; NYHA — New York Heart Association; OR — odds ratio; RDW — red cell distribution width