Table 1. Demographic Characteristics of the Study Population (1987–2013).

Shown are the demographic characteristics of 18,144 adult emergency department (ED) patients in seven identity-unlinked seroprevalence studies in an academic inner-city ED, Baltimore, Maryland.

Characteristic	Demographics of Study Population by Study Year (%)
	1987	1988	1992	2001	2003	2007	2013
	N=2302	N=2544	N=1606	N=1418	N=2144	N=3417	N=4713
	Sex
Male	51.0	48.3	52.9	47.8	45.5	46.0	45.1
Female	49.0	51.7	47.1	52.2	54.5	54.0	54.9
Race
Black	74.0	77.3	77.7	68.0	69.0	67.3	63.1
White	24.9	22.1	21.5	28.3	26.4	26.9	29.4
Other	1.0	0.7	0.8	3.7	4.6	5.9	7.6
Age (years)
Mean (SD)	43.4±18.8	43.3±18.9	42.6±18.0	47.1±17.0	48.0±17.1	46.3±16.8	46.5±17.5
15–24	17.6	15.4	15.0	9.4	9.8	11.3	11.3
25–34	24.0	27.1	27.5	16.4	14.0	16.5	19.4
35–44	16.2	17.0	20.4	24.3	22.2	21.4	15.3
45–54	12.3	10.9	11.8	20.5	22.3	22.5	21.6
≥55	29.9	29.6	25.3	29.5	31.7	28.2	32.3