Sample characteristics were assessed descriptively using chi-square tests for categorical variables and t tests or Wilcoxon rank-sum tests for continuous variables. We compared agreement between self-report and PEth-detected alcohol exposure by summarizing PEth (proportion ≥8 ng/mL, mean and median) by AUDIT-C for HIV+ and uninfected. Of those self-reporting abstinence (AUDIT-C=0), we compared the proportion with positive PEth by HIV and HCV status, using chi-square tests.
