• Sonal J Patil, Todd Ruppar, Richelle J Koopman, Erik J Lindbloom, Susan G Elliott, David R Mehr, and Vicki S Conn.
• Department of Family and Community Medicine, University of Missouri, Columbia, Missouri patilso@health.missouri.edu.
• Ann Fam Med. 2016 Nov 1; 14 (6): 540551540-551.

PurposePeer support intervention trials have shown varying effects on glycemic control. We aimed to estimate the effect of peer support interventions delivered by people affected by diabetes (those with the disease or a caregiver) on hemoglobin A1c (HbA1c) levels in adults.MethodsWe searched multiple databases from 1960 to November 2015, including Ovid MEDLINE, the Cochrane Central Register of Controlled Trials, CINAHL, and Scopus. We included randomized controlled trials (RCTs) of adults with diabetes receiving peer support interventions compared with otherwise similar care. Seventeen of 205 retrieved studies were eligible for inclusion. Quality was assessed with the Cochrane risk of bias tool. We calculated the standardized mean difference (SMD) of change in HbA1c level from baseline between groups using a random effects model. Subgroup analyses were predefined.ResultsSeventeen studies (3 cluster RCTs, 14 RCTs) with 4,715 participants showed an improvement in pooled HbA1c level with an SMD of 0.121 (95% CI, 0.026-0.217; P = .01; I2 = 60.66%) in the peer support intervention group compared with the control group; this difference translated to an improvement in HbA1c level of 0.24% (95% CI, 0.05%-0.43%). Peer support interventions showed an HbA1c improvement of 0.48% (95% CI, 0.25%-0.70%; P <.001; I2 = 17.12%) in the subset of studies with predominantly Hispanic participants and 0.53% (95% CI, 0.32%-0.73%; P <.001; I2 = 9.24%) in the subset of studies with predominantly minority participants; both were clinically relevant. In sensitivity analysis excluding cluster RCTs, the overall effect size changed little.ConclusionsPeer support interventions for diabetes overall achieved a statistically significant but minor improvement in HbA1c levels. These interventions may, however, be particularly effective in improving glycemic control for people from minority groups, especially those of Hispanic ethnicity.© 2016 Annals of Family Medicine, Inc.

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