Kelly 2014.

Methods	Allocation: randomised Blindness: not stated Study duration: 6 months Location: multicentre Design: parallel Setting: not stated Country: USA Consent: written
Participants	Diagnosis: serious mental illness N = 24 History: not stated Sex: men 13, women 11 Age: mean 46.78, SD 8.45 years Exclusion criteria: participants could not be under conservatorship (a legal concept in the US) (required by the County Department of Mental Health), unable to give informed consent or be hospitalised at the start of the study.
Interventions	Group 1: peer‐support + standard care (n = 12). Content: manualised intervention. Navigators encouraged development of self‐management of healthcare through a series of psychoeducation and behavioural strategies. Delivered by: peers. Frequency: not stated. Treatment duration: 6 months. Group 2: standard care (n = 12). Content: usual mental health services. Treatment duration: 6 months.
Outcomes	Leaving the study early Unable to use Service use: contact with services (skewed data) Global state: compliance to medication (skewed data) Health issues: bodily pain, bodily pain interference, total number of health problem, health lack of efficacy, preferred location of care, number of physical medications (not predefined outcomes for this review).
Notes	Funding sources: funded with support from the UniHealth Foundation.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Participants were recruited in group of six and then randomized (by the project manager) using a random numbers table."
Allocation concealment (selection bias)	Unclear risk	Comment: author did not describe allocation concealment. Insufficient information to make judgement.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Comment: the author did not describe the blinding of participants and personnel. Insufficient information to make judgement.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: the author did not describe the blinding of outcome assessment. Insufficient information to make judgement.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: 3 participants in the control group left the study early. Low attrition rate.
Selective reporting (reporting bias)	Unclear risk	Comment: study protocol not available. Insufficient information to make judgement.
Other bias	Low risk	None noted.