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Table 8 Sources for variables used to predict savings from medication-assisted treatment referrals

From: Mitigating the heroin crisis in Baltimore, MD, USA: a cost-benefit analysis of a hypothetical supervised injection facility

Variable Value Note Source
Number of SIF clients (N) 2100 Approximate monthly unique Insite injection room clients Maynard [33]
Percent of SIF users who access MAT as a result of SIF referrals (r) 5.78% From MSIC MSIC [12]
Treatment retention factor (f) 50% General retention rate estimated at 60–90% CSAM [104]
Cost-benefit ratio for MAT (b) 4.5 Conservative: average of low estimates Cartwright [51], Gerstein [105], Health Canada [32], Harris et al. [52], CHPDM [53]
Average cost of 1 year of MAT (T) $4000   Schwartz et al. [106]