The primary endpoint in this analysis was self-reported MMT discontinuation in the last six months (yes vs. no) on the administered questionnaire, defined as reporting accessing methadone at one study visit and reporting not being on methadone at a subsequent study visit. Sociodemographic variables included age, sex (male vs. female), ethnicity (White vs. other race or ethnicity), stable relationship status, defined as being legally married, common-law, or having a regular partner (stable vs. other), education (high school or greater vs. less than high school), and HIV status (HIV-positive vs. HIV-negative). Social-structural risk factors included recent incarceration (yes vs. no), homelessness (yes vs. no), and not accessing government income assistance (yes vs. no). Drug use variables considered included crack cocaine smoking (≥daily vs.<daily), heroin injection (≥daily vs. <daily), cocaine injection (≥daily vs. <daily), prescription opioid injection or non-injection use (≥daily vs. <daily), methamphetamine use (≥daily vs. <daily), binge alcohol use (yes vs. no), and binge injection use (yes vs. no). Factors associated with MMT were also considered and included length of time on methadone, defined as the proportion of consecutive follow-ups
