• Jeremy Dale, Isabela O Caramlau, Antje Lindenmeyer, and Susan M Williams.
• Health Sciences Research Institute, Warwick Medical School, University of Warwick, Gibbet Hill campus, Coventry, Warwickshire, UK, CV4 7AL. jeremy.dale@warwick.ac.uk
• Cochrane Db Syst Rev. 2008 Oct 8 (4): CD006903.

BackgroundPeer support telephone calls have been used for a wide range of health-related concerns. However, little is known about their effects.ObjectivesTo assess the effects of peer support telephone calls in terms of physical (e.g. blood pressure), psychological (e.g. depressive symptoms), and behavioural health outcomes (e.g. uptake of mammography) and other outcomes.Search StrategyWe searched: The Cochrane Library databases (CENTRAL, DARE, CDSR) (issue 4 2007); MEDLINE (OVID) (January 1966 to December 2007); EMBASE (OVID) (January 1985 to December 2007); CINAHL (Athens) (January 1966 to December 2007), trials registers and reference lists of articles, with no language restrictions.Selection CriteriaRandomised controlled trials of peer support interventions delivered by telephone call.Data Collection And AnalysisTwo review authors independently extracted data. We present results narratively and in tabular format. Meta-analysis was not possible due to heterogeneity between studies.Main ResultsWe included seven studies involving 2492 participants.Peer support telephone calls were associated with an increase in mammography screening, with 49% of women in the intervention group and 34% of women in the control group receiving a mammogram since the start of the intervention (P 12). The peer support intervention significantly decreased depressive symptomatology at the 4-week assessment (odds ratio (OR) 6.23 (95% confidence interval (CI) 1.15 to 33.77; P = 0.02)) and 8-week assessment (OR 6.23 (95% CI 1.40 to 27.84; P = 0.01). One study investigated the use of peer support for patients with poorly controlled diabetes. There were no significant differences between groups for self-efficacy, HbA1C, cholesterol level and body mass index.Authors' ConclusionsWhilst this review provides some evidence that peer support telephone calls can be effective for certain health-related concerns, few of the studies were of high quality and so results should be interpreted cautiously. There were many methodological limitations thus limiting the generalisability of findings. Overall, there is a need for further well designed randomised controlled studies to clarify the cost and clinical effectiveness of peer support telephone calls for improvement in health and health-related behaviour.

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