Table 1.

Demographic Characteristics of Study Cohorts

Characteristic	Total Population (N = 783)	Cohort 1^* (n = 332)	Cohort 2^† (n = 447)	P
Average age (mean years ± SD)	32.9 ± 120.1	32.4 ± 11.8	33.2 ± 12.3	.38
Race^‡				.53
White	325	67%	61%
African American	67	13%	13%
Asian/Pacific Islander	42	7%	9%
Other	78	14%	16%
Socioeconomic status^‡				.26
Lower	243	33%	30%
Higher	534	67%	70%
Active duty soldier	193	29%	22%	.02

↵* No urine culture ordered.
↵† Urine culture ordered.
↵‡ Some patients were missing data from these variables: race, n = 267; socioeconomic status, n = 2. Unpaired t test was used to compare means, χ² test was used to compare proportions (missing data excluded).