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Treatment retention. Percentage of patients retained in treatment across 8 weeks for the 3 treatment conditions (placebo, 192 mg NTX, and 384 mg NTX). Retention rates were measured twice a week. The data points labeled with the bracket indicate a clinically meaningful difference that provides justification (anchor) for the parameters chosen in the Comer et al. [10] study. Reprinted with permission from Comer et al. [11]
