Table I.

Demographics of Healthy Volunteers Interviewed.

	Phase I Facilities
	East		Midwest		West
Facility Location	Clinic 1	Clinic 2	Clinic 3	Clinic 4	Clinic 5	Clinic 6	Total
Total subjects	42	29	36	46	47	35	235
Sex/gender
Male, percent (n)	88.1 (37)	79.3 (23)	75.0 (27)	52.2 (24)	74.5 (35)	74.3 (26)	73.2 (172)
Female, percent (n)	11.9 (5)	20.7 (6)	25.0 (9)	47.8 (22)	25.5 (12)	25.7 (9)	26.8 (63)
Race/ethnicity
White, non-Hispanic, percent (n)	19.0 (8)	17.2 (5)	44.4 (16)	78.3 (36)	38.3 (18)	14.3 (5)	37.4 (88)
White, Hispanic, percent (n)	4.8 (2)	0(0)	0(0)	0(0)	44.9 (21)	74.3 (26)	20.9 (49)
Black, non-Hispanic, percent (n)	61.9 (26)	79.3 (23)	52.8 (19)	17.4 (8)	8.5 (4)	5.7 (2)	34.9 (82)
Black, Hispanic, percent (n)	0(0)	3.4(1)	0(0)	0(0)	2.1 (1)	0(0)	0.9 (2)
Asian, percent (n)	11.9 (5)	0(0)	0(0)	4.3 (2)	2.1 (1)	2.9(1)	3.8 (9)
Native American, percent (n)	0(0)	0(0)	0(0)	0(0)	2.1 (1)	2.9(1)	0.9 (2)
Biracial, percent (n)	2.4(1)	0(0)	2.8(1)	0(0)	2.1 (1)	0(0)	1.3 (3)
First-time participants, percent (n)	11.9 (5)	17.2 (5)	72.2 (26)	32.6 (15)	38.3 (18)	8.6 (3)	30.6 (72)