<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 on MMT relative to the total number of participant follow-ups (>50% vs. ≤50%), and MMT dose at most recent follow-up prior to MMT discontinuation (or most recent study visit if no MMT discontinuation was reported) (>60 to ≤100 mg vs. ≤60 mg and > 100 mg vs. ≤60 mg). Records where methadone dosage was missing were removed from analyses. All behaviors referred to activities in the 6 months prior to interview.
