Table 1.

Baseline characteristics of subjects who contributed observation time.

	HIV+		Uninfected

	(N=44,787)		(N=96,852)

	N	%	N	%
Age at enrollment years
20–29	1,973	4	4,077	4
30–39	8,210	18	17,138	18
40–49	17,574	39	37,157	38
50–59	11,632	26	25,929	27
60–69	4,174	9	9,580	10
≥70	1,224	3	2,971	3

Sex
Female	1,119	2	2,583	3
Male	43,668	98	94,269	97

Race/ethnicity
Non-Hispanic white	17,311	39	38,138	39
Non-Hispanic black	21,888	49	45,676	47
Hispanic	3,191	7	7,418	8
Other/unknown	2,397	5	5,620	6

Alcohol abuse/dependence
No	29,487	66	65,117	67
Yes	15,300	34	31,735	33

Smoking status
Never	9,856	22	24,919	26
Ever	27,395	61	59,647	62
Unknown	7,536	17	12,286	13

Hepatitis C virus status^a
HCV negative	24,166	54	51,628	53
Chronic HCV	9,423	21	9,694	10
HCV exposure	3,453	8	3,967	4
Never tested/unknown	7,745	17	31,563	33
Hepatitis B virus status^b
HBV negative	31,317	70	41,279	43
HBV positive	1,181	3	282	0.3
HBV acute resolved	428	1	153	0.2
Unconfirmed HBV	570	1	177	0.2
Never tested/unknown	11,291	25	54,961	57

Definitions: HCV negative, negative HCV antibody test result(s) only; Chronic HCV, positive HCV RNA test; HCV exposure, positive HCV antibody test, but negative or unknown HCV RNA test; Never tested/unknown, no HCV laboratory test results available.

Definitions: HBV negative, negative HBV surface antigen test result(s) only; HBV positive, at least two positive HBV surface antigen tests over 6 months apart; HBV acute resolved, positive HBV surface antigen test followed by only negative test results; Unconfirmed HBV, one positive HBV surface antigen test not confirmed with additional testing; Never tested/unknown, no HBV laboratory test results available.