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. Author manuscript; available in PMC: 2018 Jan 1.
Published in final edited form as: J Subst Abuse Treat. 2016 Sep 9;72:32–39. doi: 10.1016/j.jsat.2016.08.020

Fig. 2.

Fig. 2

Scatter plot of Treatment Effectiveness Score (TES) by Snaith-Hamilton Pleasure Scale (SHAPS) scores, including a line depicting the negative binomial fit for TES with 95% confidence limits, showing that higher self-reported anhedonia, as indicated by higher scores on the SHAPS, related to lower effectiveness for contingency management treatment, as indicated by lower TES. This graph depicts scores for all participants regardless of medication condition, as all participants received contingency management. Of note, we selected a negative binomial model for the fitted curve to address significant skew in the raw data.