Table 2. Association between lactate quartiles and the rate of CIN by different definitions.

CIN definitions	Outcome
	Lac Q1 (n=55)	Lac Q2 (n=56)	Lac Q3 (n=60)	Lac Q4 (n=56)	P value
sCr increase ≥0.5 mg/dL or ≥25% within 72 h, n (%)	5 (9.1)	7 (12.5)	12 (20.0)	23 (41.1)	<0.001
sCr increase ≥0.5 mg/dL within 72 h, n (%)	0 (0)	2 (3.6)	1 (1.7)	8 (14.3)	0.002
sCr increase ≥0.3 mg/dL or 50% within 72 h, n (%)	3 (5.5)	3 (5.5)	6 (10.0)	12 (21.4)	0.018
sCr increase ≥0.3 mg/dL or 50% within 48 h, n (%)	1 (1.8)	2 (3.6)	2 (3.3)	13 (23.2)	<0.001

CIN, contrast-induced nephropathy; sCr, serum creatinine.