Figure 2.
Forest plot of the effect of opioid substitution therapy on adherence to antiretroviral therapy (ART) among people who inject drugs (PWID), defined as the proportion achieving a defined threshold of ART adherence, whether self-reported or objectively measured. I2 and P value are measures of between-study heterogeneity. Abbreviations: CI, confidence interval; measure, method of measurement of adherence; N, total sample size of PWID; OR, odds ratio; threshold, percentage of doses taken to indicate adherence.