Fig. 1From: Evaluation of respondent-driven sampling in seven studies of people who use drugs from rural populations: findings from the Rural Opioid InitiativeForest plots of unweighted and RDS-weighted measures of association for the relationship between (a) fentanyl use, (b) heroin use, and (c) age and positive Hepatitis C Virus antibody status. Abbreviations: HCV, hepatitis C virus. Reference period for fentanyl and heroin use: past 30 daysBack to article page