. Author manuscript; available in PMC: 2019 Apr 1.

Published in final edited form as: J Subst Abuse Treat. 2018 Jan 11;87:1–8. doi: 10.1016/j.jsat.2018.01.007

Table 4.

Independent factors associated with concurrent drug injection while prescribed opioid agonist therapies (N=434)

Characteristic	Bivariate logistic regression		Multivariable logistic regression
Characteristic	uOR (95% CI)	P-value	aOR (95% CI)	P-value
Prescribed MMT (referent: BMT)	2.8 (1.4–5.7)	0.0035	2.8 (1.4–5.8)	<0.0001
Lower daily OAT dose^* (referent: higher doses)	1.6 (1.02–2.5)	0.0391	1.7 (1.1–2.7)	0.0314
High addiction severity (referent: low to moderate addiction severity)	2.4 (1.5–3.8)	0.0003	2.3 (1.4–3.8)	0.0030
Age of drug injection initiation (<16 years)	2.2 (1.3–3.6)	0.0020	2.3 (1.3–3.9)	0.0040
Alcohol use disorder	2.4 (1.5–3.9)	0.0002	2.1 (1.3–3.5)	0.0047
Living with parents	0.6 (0.4–0.9)	0.0354	0.5 (0.3–0.9)	0.0117

Legend: OAT: opioid agonist therapy; MMT: methadone maintenance treatment; BMT: buprenorphine maintenance; OR: odds ratio; uOR: unadjusted odds ratio; aOR: adjusted odds ratio; CI: confidence interval.

Lower OAT doses included <75 mg for MMT and <10 mg for BMT