Table 1.

Demographics of the initial participants.

	Palo Alto (N = 1009)		Durham (N = 485)		Kannapolis (N = 492)		LA (N = 516)		All BHS sites (N = 2502)
Variable	n	Mean (%)	n	Mean (%)	n	Mean (%)	n	Mean (%)	n	Mean (%)
Age <45	404	40.0	183	37.7	290	58.9	154	29.8	1031	41.2
Age 45–64	285	28.2	228	47.0	162	32.9	212	41.1	887	35.5
Age 65+	320	31.7	74	15.3	40	8.1	150	29.1	584	23.3
Female	529	52.4	288	59.4	260	52.8	298	57.8	1375	55.0
Male	480	47.6	197	40.6	232	47.2	218	42.2	1127	45.0
White	650	64.4	224	46.2	324	65.9	384	74.4	1582	63.2
Black or African American	72	7.1	194	40.0	42	8.5	92	17.8	400	16.0
Asian	165	16.4	35	7.2	54	11.0	6	1.2	260	10.4
American Indian or Native American	10	1.0	8	1.6	6	1.2	7	1.4	31	1.2
Hawaiian or Pacific Islander	13	1.3	4	0.8	10	2.0	0	0.0	27	1.1
Other	99	9.8	20	4.1	56	11.4	27	5.2	202	8.1
Hispanic	140	13.9	20	4.1	79	16.1	52	10.1	291	11.6

Demographics summary by site for the first 2502 participants.

The Duke study sites consist of both Durham and Kannapolis.