Table 4.

Multivariable models of efficacy outcome, linear mixed model (measurement 1), logistic mixed model (measurement 2), fixed effects

	Multivariable modelsa
	Coef.	(95%CI)	p
Measurement 1: Hand hygiene frequency before injectionb,c
Intercept	3.06	(1.44–4.68)
Baseline visit (pre-intervention)	0
2-week follow-up visit (post-intervention)	0.58	(0.22–0.95)	0.002
6-week follow-up visit (post-intervention)	0.61	(0.23–0.99)	0.002
Measurement 2: Rates of injecting-related infectiond	aOR	(95%CI)	p
Baseline visit (pre-intervention)	1
6-week follow-up visit (post-intervention)	0.23	(0.07–0.80)	0.021

Measurement 1, n = 58 participants, n = 148 visits; Measurement 2, n = 59 participants, n = 102 visits)

Abbreviation: aOR Adjusted Odds Ratio

^aAll models were a priori adjusted for age, gender, education level, housing stability and injection frequency

^bPrevious 2 weeks

^c5-point Likert scale ranging from 0 = Never to 4 = Always

^d(during the previous month)