Figure 6.

Retention in treatment: Contingency management versus no contingency management.

^*Mantel-Haenszel fixed method.

Meta-analysis of studies from Amato et al (Bickel, 2008; Chopra, 2009; Gross, 2006; Jiang, 2012; Kosten, 2003; Oliveto, 2005; Petry, 2005; Silverman, 2004; Stitzer, 1992),¹⁸ Ainscough et al (Chutuape, 1999; Chutuape, 2001; Kidorf, 1996; Ling, 2013; Peirce, 2006; Petry, 2002; Petry, 2007; Preston, 2000),²⁰ and Davis et al (Chen, 2013; Defulio, 2012; Dunn, 2013; Everly, 2011; Hser, 2011; Jiang, 2012; Kidorf, 2013).²¹