Table 2. Demographics of study participants in Mountjoy Prison, Ireland (September 2018).

Variable	Value n	Value %	Mean (SD)
Age			39.5 (6.4)
Age of first incarceration			18.3 (6.8)
Episodes of incarceration			8 (2.6)
Total time incarcerated (years)			12.5 (5.8)
Age of first drug use			15. 3 (3.2)
Age of first Injecting drug use			18.5 (3.2)
Country of origin
Ireland	23	92
HCV acquisition risk factors
History of heroin use	25	100
History of injecting drug use	25	100
Shared needles (syringes) in the community	18	72
Shared equipment (drug taking paraphernalia) in the community	25	100
Shared razor in prison(ever)	2	8
Shared toothbrush in prison(ever)	2	8
Prison tattoo	8	32
Unsterile tattoo community	2	8
Self-declared alcohol use
Alcohol problem prior to incarceration	8	32
Treatment for alcohol use	1	4
Methadone maintenance treatment (community and prison)
Methadone treatment history	18	72
Length of time on methadone maintenance treatment			9.2 (5.8)

Values are means (±SD) for continuous variables or n (%) for categorical variables