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Table 2 Retention rates for clients enrolled in treatment

From: Examining attrition rates at one specialty addiction treatment provider in the United States: a case study using a retrospective chart review

Authors & date # of sites Treatment model Sample size Outcome Retained Withdrew early
Kleinman et al., 1992 ![20] 1 Outpatient 86 Retained past 5 sessions 42% 58%
Ershoff et al., 1996[22] 8 Outpatient 1587 In tx past 30 days 63% 37%
Arfken et al., 2001[28] multiple Residential & outpatient 2026 In tx past 30 days 87% 13%
Claus & Kindleberger, 2002[30] 1 Residential & outpatient 195 Retained past 2 sessions 80% 20%
Brown et al., 2008 pre NIATx year[36] 1 Residential 279 Retained past 3 sessions 63% 37%
Brown et al., 2008 post NIATx year[36] 1 Residential 674 Retained past 3 sessions 70% 30%
Curran et al., 2007[4] > 10 Outpatient 9,933 Retained past 5 sessions 73% 27%
Ghee et al., 2009[37] 1 Outpatient 104 In tx past 30 days 46% 54%
Adams et al., 2011[38] 1 Residential 105 In tx past 30 days 77% 23%
Pinto et al., 2011[33] 6 Outpatient 346 Retained past 5 sessions 83% 17%
McHugh et al., 2013[39] 1 Methadone Maintenance 78 Retained past 11 sessions 77% 23%
Choi et al., 2013[40] 3 Residential 1,317 In tx past 30 days 44% 56%
Garnick et al., 2014[13] 783 Residential & Outpatient 106,662 Retained past 3 sessions 74% 26%
Carroll, 1997 (literature review)[3] 24 studies Outpatient >4,000   56% 44%
30-day retention weighted average without Garnick[13] 71% 29%
30-day retention un-weighted average 68% 32%