Table I.

Sociodemographics of male participants in Seattle-area NHBS IDU and MSM surveys, 2008–2012

	MSMa		Amphet.-injecting MMS/IDUb		Other MSM/IDU		IDUc		Amphet.-injecting MSM/IDU vs.
									MSM	Other MSM/IDU	IDU
	n/N	%	n/N	%	n/N	%	n/N	%	p-value	p-value	p-value
Age
18 – 29	268/680	39%	16/89	18%	7/66	11%	67/649	10%	p=3·10−5	p=0.16	p=3·10−6
30 – 39	189/680	28%	28/89	32%	23/66	35%	147/649	23%
40 – 49	136/680	20%	35/89	39%	21/66	32%	176/649	27%
≥ 50	87/680	13%	10/89	11%	15/66	23%	259/649	40%
Race
White	419/678	62%	63/88	72%	44/66	67%	376/649	58%	p=0.02	p=0.19	p=0.02
Black	56/678	8%	7/88	8%	7/66	11%	139/649	21%
Hispanic	81/678	12%	8/88	9%	4/66	6%	52/649	8%
Native American	8/678	1%	4/88	5%	0/66	0%	20/649	3%
Asian	54/678	8%	1/88	1%	1/66	2%	1/649	0.2%
Multiple races	60/678	9%	5/88	6%	10/66	15%	61/649	9%
Area of residence
North Seattle	112/662	17%	7/84	8%	13/66	20%	89/635	14%	p=2·10−6	p=0.06	p=4·10−8
Downtown Seattle	79/662	12%	29/84	35%	27/66	41%	290/635	46%
Capitol Hill	151/662	23%	10/84	12%	4/66	6%	19/635	3%
Central District	151/662	23%	21/84	25%	11/66	17%	53/635	8%
South Seattle	75/662	11%	7/84	8%	5/66	8%	93/635	15%
South King County	57/662	9%	4/84	5%	6/66	9%	67/635	11%
East King County	37/662	6%	6/84	7%	0/66	0%	24/635	4%
Education
< High school grad.	22/680	3%	15/89	17%	14/65	22%	167/649	26%	p=3·10−10	p=0.01	p=1·10−8
High school grad.	120/680	18%	22/89	25%	24/65	37%	287/649	44%
Post high school	251/680	37%	38/89	43%	27/65	42%	172/649	27%
College grad	287/680	42%	14/89	16%	0/65	0%	23/649	4%
Currently homeless	28/680	4%	28/89	32%	30/66	46%	316/649	49%	p<10−16	p= 0.08	p=0.002
Incarcerated, 12 mo.	34/680	5%	24/81	30%	20/60	33%	272/628	43%	p=3·10−15	p=0.64	p=0.02
Total N	680		89		66		649

^aNo injection in previous 12 months

^bMSM/IDU reporting amphetamines as the drug they most frequently injected.

^cMales only, no male-to-male sex in the previous 12 months