Table 1.

Hepatitis C virus (HCV) antibody status by years of injection drug use: prevalence and incidence per 100-person years (n = 332*).

				Sample	Incidence
Years of Injection		HCV-	HCV+	Prevalence	per 100 person years
<1 year	(1–11 montds)	68	2	2.9%	6
1 year	(12–18 montds)	7	1	12.5%	13
2 years	(19–30 montds)	38	10	20.8%	12
3 years	(31–42 montds)	27	11	28.9%	11
4 years	(43–54 montds)	20	6	23.1%	7
5 years	(55–66 montds)	19	14	42.4%	11
6 years	(67–78 montds)	18	12	40.0%	8
7 years	(79–90 montds)	9	8	47.1%	9
8 yrs or more	(> = 91 montds)	25	37	59.7%
	Total	231	101	30.4%	10

*Sample total is 332 instead of 337 because we could not ascertain years of injection for 5 participants.