Table 2. The relationship between ACEI/ARB and CIAKI before and after matching all patients.

Definitions	Unmatched cohort		Matched cohort
	OR (95% CI)*	P value*	OR (95% CI)**	P value**
Primary CIAKI end point:
SCr increase ≥ 25% or 44 umol/l in 72 hours	1.757 (1.401-2.203)	<0.001	1.993 (1.415-2.809)	<0.001
Other defining criteria for CIAKI:
SCr increase ≥ 25% or 44 umol/l in 24 or 48 hours	1.583 (1.259-1.990)	<0.001	1.725 (1.209-2.460)	<0.001
SCr increase ≥ 50% or 26.4 umol/l in 48 hours	2.009 (1.510-2.673)	<0.001	2.695 (1.672-4.343)	<0.001

^*Multivariable analysis was applied in the unmatched cohort. OR and 95% confidence interval (CI) were obtained by adjusting variables.

^**Conditional logistic model was applied in the matched cohort, OR with 95% confidence interval (CI) was obtained.

Abbreviations: SCr, serum creatinine; CIAKI, contrast-induced acute kidney injury.