Table 1.

Patient demographic characteristics.

Demographics		All patients (N=500)	Training cohort (n=350)	Test cohort (n=150)	P value
Female, n (%)		220 (44.0)	153 (43.7)	67 (44.7)	.85a
Age (years)						.16b
	Mean (SD)	64.3 (10.7)	64.8 (10.7)	63.3 (10.5)
	Range	25-91	34-91	25-90
Race,c n (%)						.95a
	White	442 (89.1)	308 (88.8)	134 (89.9)
	Black	50 (10.1)	36 (10.4)	14 (9.4)
	Asian	4 (0.8)	3 (0.9)	1 (0.7)
Hispanic, Latino, or other ethnicity		2 (0.4)	1 (0.3)	1 (0.7)	.49a

^aFisher exact test comparing training and test cohorts.

^bLinear model analysis of variance comparing training and test cohorts.

^cNo information on race was available for 4 patients.