Davidson 2004.

Methods	Allocation: randomised. Blinding: open‐label. Duration: 9 months. Design: parallel. Setting: outpatients. Country: United States.
Participants	Diagnosis: mood, anxiety, or schizophrenia‐spectrum disorder; DSM‐IIIR. N = 260. Age: Mean 42 years (SD 11). Sex: 112M, 148F History: seriously ill, psychiatrically stable for the past 6 months (not hospitalised or institutionalised) and have moderate to severe impairments in social and occupational functioning. Exclusions:
Interventions	1. Supportive therapy with consumer partner (volunteer with similar psychiatric history who has recovered and has his/her social network) with shared interests, within the same age range and gender of the participant. N = 95. 2. Supportive therapy with non‐consumer partner (volunteer without psychiatric history) with shared interests, within the same age range and gender of the participant. N = 95. 3. TAU: not matched with a partner. N = 70. Participants in each treatment group were given a $28 stipend each month.
Outcomes	Mental state: BPRS, CESD, GHQ. Global State: GAF. Quality of Life: RSES, WBS. General Functioning: SFS. Unable to use ‐ Satisfaction with service: SWS ( scale not validated).
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"Randomly assigned", no further details reported.
Allocation concealment (selection bias)	Unclear risk	No information reported.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No information reported.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No information reported.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Losses to follow‐up not reported.
Selective reporting (reporting bias)	Low risk	All expected outcomes are reported.
Other bias	Low risk	The study appears to be free of other sources of bias.