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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: J Subst Abuse Treat. 2013 Sep 9;46(1):10.1016/j.jsat.2013.08.003. doi: 10.1016/j.jsat.2013.08.003

Figure 1.

Figure 1

Box plots for percent interactive-voice-response calls completed by contingency-management-incentive group with means (diamonds), medians (horizontal bars), interquartile range (box), and whiskers (1.5*IQR). The sample included 20 in the prize CM group and 37 in the fixed-dollar group. Circles represent outliers, defined as values more than 1.5 interquartile range above the median.