Table 1:

Age specific and age adjusted prevalence of HIV infection and HIV self-reported testing by demographic and behavioral risk factors for NHANES 2009–2018

	Percent HIV Positive						Percent HIV Tested
Cofactor	Sample Size	Percent	Lower 95% CI~	Upper 95% CI	P-value*		Sample Size	Percent	Lower 95% CI	Upper 95% CI	P-value*
Total	18480	0.41	0.27	0.61			17173	44.2	42.7	45.7
Age
18–39 (Ref)	9925	0.20	0.11	0.31			9263	43.6	41.8	45.4
40–49	4361	0.69	0.28	1.39	0.057		3989	50.0	47.4	52.6	<0.001
50–59	4194	0.65	0.38	1.02	0.005		3921	37.8	35.3	40.4	<0.001
Sex
Men	8871	0.70	0.44	1.06	<0.001		8458	39.6	37.6	41.7	<0.001
Women (Ref)	9609	0.13	0.07	0.23			8715	49.0	47.3	50.7
Race and Hispanic Origin1
Non-Hispanic white	6649	0.29	0.12	0.59	<0.001		6171	42.4	40.5	44.3	<0.001
Non-Hispanic black (Ref)	3907	1.61	1.18	2.14			3823	64.3	61.8	66.7
Hispanic	4996	0.24	0.13	0.42	<0.001		4596	39.6	37.1	42.1	<0.001
All non-black2	14573	0.25	0.12	0.46	<0.001		13350	41.4	39.9	42.9	<0.001
Education
Less than highh school	4000	0.36	0.18	0.63	0.597		3624	38.1	35.4	40.7	<0.001
Completed high school/GED	4256	0.38	0.19	0.68	0.737		4049	39.9	37.7	42.2	<0.001
More than completed HS/GED (Ref)	10214	0.43	0.24	0.73			9492	47.3	45.6	48.9
Poverty Index Ratio3
Below poverty	4186	0.73	0.47	1.07	0.035		3885	46.2	43.8	48.7	0.108
At or above (Ref)	12622	0.36	0.20	0.59			11801	44.1	42.4	45.7
Marital Status
Married/ living / widowed (Ref)	10581	0.33	0.16	0.61			9591	44.7	42.9	46.5
Divorced/Separated	2266	0.29	0.12	0.62	0.816		2107	57.0	54.5	59.5	<0.001
Never married	4317	0.98	0.71	1.32	0.001		4135	48.5	45.7	51.4	0.023
Health Insurance
Any (Ref)	13445	0.42	0.25	0.64	0.774		12499	45.1	43.5	46.7	<0.001
None	5004	0.37	0.16	0.72			4645	41.0	38.8	43.3
Regular place for health care
Any (Ref)	14329	0.45	0.29	0.68	0.281		13288	46.0	44.4	47.7	<0.001
None	4150	0.26	0.07	0.66			3884	38.1	35.9	40.4
Health Care in the past 12 months
Any (Ref)	14508	0.48	0.31	0.72	0.001		13466	46.7	45.1	48.4	<0.001
None	3949	0.10	0.03	0.26			3685	34.4	31.9	37.0
Lifetime number of sexual partners
0–4 (Ref)	6993	0.07	0.02	0.17			7167	29.3	27.8	30.8
5–9	4037	0.22	0.10	0.41	0.035		4118	46.7	44.5	48.9	<0.001
10 or more	5270	0.90	0.54	1.41	0.001		5400	60.3	58.0	62.7	<0.001
Age of first intercourse
<18 years	9389	0.47	0.31	0.69	0.380		9633	50.7	48.9	52.4	<0.001
18 or older (Ref)	7006	0.37	0.17	0.69			7161	35.3	33.5	37.2
History of sexual contact with same sex among men
Any	423	8.84	5.05	14.11	<0.001		432	69.2	62.4	75.4	<0.001
None (Ref)	7657	0.18	0.08	0.35			7864	37.8	35.8	39.8
Ever used injection or illicit drugs
Any	2818	0.84	0.41	1.53	0.021		2863	55.4	52.8	58.0	<0.001
None (Ref)	13603	0.30	0.19	0.45			13957	41.7	40.2	43.3
Herpes Simplex virus type 2 infection status4
Positive HSV-2	2537	1.22	0.51	2.44	0.004		2207	66.3	62.9	69.6	<0.001
Negative HSV-2 (Ref)	11728	0.17	0.05	0.41			10265	41.8	39.6	43.9

Ref=Reference Group

^~Confidence Interval

^*p-value from linear contrast comparing subgroup to reference group

¹All non-Hispanic others including multiracial are not reported individually but are included in the estimates for the total population and all non-black persons

²Consists of all non-Hispanic white, Hispanic, and non-Hispanic others combined

³Below vs at or above the poverty line based on the U.S. Department of Health and Human Services poverty index ratio adjusted for family size.

⁴Measured only on those age 18–49