Randomised controlled trials (RCTs) of non-pharmacological treatments for depression that assessed both glycaemic control and depressive symptoms in individuals with type 2 diabetes and depression were eligible for inclusion in the review. Glycaemic control had to be assessed using levels of haemoglobin A1C (HbA1C). Studies were excluded from the review if they included patients with other psychiatric disorders, included young-aged patients or provided insufficient information about depression level and HbA1C.
Included studies assessed the effects of combined cognitive behavioural therapy (CBT) and self-management education versus self-care management education alone; or a collaborative depression care programme (based on antidepressants and/or psychological treatment tailored to participants' individual needs) versus usual care. The number of weekly intervention sessions ranged from six to 12, each lasting from 30 to 60 minutes. Follow-up ranged from three to 12 months. The mean ages of participants ranged from 53.1 years to 58.6 years, with the exception of one study where the mean age was 71.2 years.
Two reviewers assessed each study for inclusion.