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Table 1 Characteristic of the included studies

From: Collaborative care for patients with depression and diabetes mellitus: a systematic review and meta-analysis

Author Year Country Study design Study period conducted Setting Age, mean (y) Gender, male (%) Ethnicity, white (%) Randomized sample size (Intervention/control) Follow-up Loss to follow-up based on primary outcome (%) Intention-to-treat analysis
Bogner et al. [26] 2012 US RCT From April 2010 to April 2011 3 Primary care practices 57 58 (32) 65 (36) 92/88 6, 12 wk Intervention group: 0/92 (0%) Used
Control group: 0/88 (0%)
Bogner et al. [27] 2010 US RCT From April 2007 to June 2008 1 Primary care practice 60 9 (16) 0 (0)* 29/29 6 wk Intervention group: 0/29 (0%) Not used
Control group: 0/29 (0%)
Ciechanowski et al. [31] 2006 US RCT Not clear 9 health maintenance organization clinics 58 112 (36) 248 (78) 160/164 3, 6, 12 mo Intervention group: 0/160 (0%) Used
Control group: 0/164 (0%)
Ell et al. [32] 2011 US RCT From August 2005 to August 2007 2 public safety-net clinics Not clear** 69 (18) Not clear*** 193/194 6, 12, 18, 24 mo Intervention group: 55/193 (28.5%) Used
Control group: 68/194 (35.1%)
Katon et al. [19] 2010 US RCT From May 2007 to October 2009 14 Primary care clinics 57 103 (48) 169 (79) 106/108 6, 12 mo Intervention group: 12/106 (11.3%) Used
Control group: 16/108 (14.8%)
Katon et al. [23] 2004 US RCT From March 2001 to May 2002 9 Primary care clinics 58 115 (35) 260 (79) 164/165 3, 6, 9, 12 mo Intervention group: 21/164 (13%) Used
Control group: 16/165 (9.7%)
Kinder et al. [33] 2006 US RCT Not clear Primary care clinics 58 115 (35) 248 (75) 164/165 6, 12 mo Intervention group: 18/164 (11.0%) Not used
Control group: 23/165 (13.9%)
Williams Jr et al. [28] 2004 US RCT From July 1999 to August 2001 18 Primary care clinics 70 194 (47) 265 (64) 205/212 3, 6, 12 mo Intervention group: 5/205 (2.4%) Used
            Control group: 19/212 (9.0%)  
  1. Abbreviations: mo month, SCL-20 Symptom Checklist-20, RCT Randomized Controlled Trial, US United States, wk week.
  2. *100% African American.
  3. **72% > =50 years.
  4. ***96% Hispanic.