Table 2.

HCV incidence data among different injecting drug user (IDU) populations in Scotland

UAT, Unlinked anonymous testing; VAT, Voluntary anonymous testing; p-yr, person-years; CI, confidence interval.

^*HCV antibody in saliva is a marker of hepatitis C carriage; estimates of hepatitis C carriers have been converted to estimates of HCV antibody-positive cases. A multiplier of 100/85 has been applied to studies throughout with the exception of the Greater Glasgow Community-wide survey undertaken in 2000/2001 where a multiplier of 100/96 was employed.

^†Incidence calculated using person-years method, where date of seroconversion was taken as the midpoint of the follow-up period, with the exception of the study marked (§) where the date of seroconversion was taken as the end of the follow-up period.

^‡Injected in previous 2 months (1990–1993, 1994 and 1996); injected in previous 6 months (1999 and 2001–2002).