“…We used a meta-analysis methodology to minimize these issues. We conducted a literature review to obtain papers with adherence correlation values and identified a representative sample of 14 papers (Wagner et al, 2011;Holzemer et al, 1999;Gifford et al, 2000;Carrico et al, 2011;Schneider, Kaplan, Greenfield, Li, & Wilson, 2004;Ammassari et al, 2001;Simoni, Frick, & Huang, 2006;Bottonari, Safren, McQuaid, Hsiao, & Roberts, 2010;Grant et al, 2004;Johnson, Elliott, Neilands, Morin, & Chesney, 2006;Wu, Moser, Chung, & Lennie, 2008;Maeda, Shen, Schwartz, Farrell, & Mallon, 2012;Hansen et al, 2009;Stawski, Silwinski, Almeida, & Smyth, 2008). We reserved a statistically rigorous metaanalysis for later studies.…”