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Table 1: Baseline characteristics
Characteristics Study Population (N = 918) Contrast-Exposed (N = 575) Nonexposed (N = 343) P
Age, mean (yr) 68 ± 15 67 ± 15 70 ± 14 .005^a
Sex, % women 48% 48% 48% 1.0^b
Race, % white 92% 93% 91% .3^b
Hypertension 60% 59% 62% .5^b
Diabetes 19% 17% 24% .006^b
Congestive heart failure 8% 6% 10% .03^b
Coronary artery disease 23% 22% 24% .7^b
Admission Cr (mg/dL), median 1.07 (0.8–1.2) 1.0 (0.8–1.1) 1.2 (0.8–1.4) <.001^c
Admission eGFR (mL/min/1.73 m²), median 73 (56–88) 76 (61–89) 68 (47–87) <.001^c


a Student t test.


b Fisher exact test.


c Mann-Whitney U test.

Characteristics	Study Population (N = 918)	Contrast-Exposed (N = 575)	Nonexposed (N = 343)	P
Age, mean (yr)	68 ± 15	67 ± 15	70 ± 14	.005^a
Sex, % women	48%	48%	48%	1.0^b
Race, % white	92%	93%	91%	.3^b
Hypertension	60%	59%	62%	.5^b
Diabetes	19%	17%	24%	.006^b
Congestive heart failure	8%	6%	10%	.03^b
Coronary artery disease	23%	22%	24%	.7^b
Admission Cr (mg/dL), median	1.07 (0.8–1.2)	1.0 (0.8–1.1)	1.2 (0.8–1.4)	<.001^c
Admission eGFR (mL/min/1.73 m²), median	73 (56–88)	76 (61–89)	68 (47–87)	<.001^c