TABLE 1.

Baseline demographic characteristics.

	Total (N = 343)
Age (years), mean ± SD (range)	48.0 ± 10.5 (20.0–73.0)
Age group, n (%)
18–34	32 (9.3%)
35–44	78 (22.7%)
45–54	122 (35.6%)
55–64	94 (27.4%)
≥65	17 (5.0%)
Sex, n (%)
Female	292 (85.1%)
Male	51 (14.9%)
Race, n (%)
White	253 (73.8%)
Black or African American	44 (12.8%)
Other	9 (2.6%)
Unknown	37 (10.8%)
Region, n (%)
South	230 (67.1%)
Midwest	65 (19.0%)
Northeast	20 (5.8%)
West	28 (8.2%)
Payer type, n (%)
Commercial	297 (86.6%)
Cash	37 (10.8%)
Other	9 (2.6%)