“…For overdose, confounders included: methadone use, biological sex, time since onset of injecting, excessive weekly alcohol consumption, whether prescribed naloxone in the past year, whether homeless in past six months (Darke & Hall, 2003;Handanagic, Bozicevic, Sekerija, Rutherford, & Begovac, 2019;O'Halloran et al, 2017;Riley et al, 2016). For injecting frequency, confounders included methadone use, biological sex, time since onset of injecting, whether homeless in past six months (Colledge et al, 2020;Fortier et al, 2020;Van Beek et al, 2001). For main body site of injection, confounders included: methadone use, biological sex, injected cocaine in past six months, time since onset of injecting, injecting frequency, whether homeless in past six months (Darke et al, 2001;Karimi et al, 2014;Rhodes et al, 2006).…”