Table 1.

Age and Race Characteristics of Study Participants (n = 1253) for Entire Study Period and by Year of Blood Collection (2011–2015)

characteristic	all years		year of blood collection
			2011		2012		2013		2014		2015
	n	%	n	%	n	%	n	%	n	%	n	%
all	1253	100	409	100	325	100	250	100	176	100	93	100
age (years)
40–49	77	6	26	6	31	9	11	4	7	4	2	2
50–59	179	14	58	14	51	16	39	16	19	11	12	13
60–69	499	40	143	35	132	41	105	42	74	42	45	49
70–79	376	30	114	28	84	26	79	32	70	40	29	31
80–94	122	10	68	17	27	8	16	6	6	3	5	5
race/ethnicity
white	938	75	311	76	176	54	205	82	162	92	84	90
black	90	7	31	8	40	12	18	7	0	0	1	1
hispanic	103	8	35	9	51	16	11	4	4	2	2	2
asian/paci3c islander	96	8	26	6	57	18	9	4	3	2	1	1
other/unknown	26	2	6	1	1	<1	7	3	7	4	5	6