Kopelowicz 1998.

Methods	Allocation: randomised. Blinding: no. Duration: 3 months. Setting: inpatients. Design: parallel. Country: USA.
Participants	Diagnosis: schizophrenia and schizoaffective disorders (DSM‐IV). N = 46. Sex: M 30, F 16. Age: mean ˜ 33.9 years. History: in hospital (mean ˜ 2 years) prior to the study.
Interventions	1. Social skills training: Spanish language version of the UCLA Social and Independent Living Series. Three months of skills training four days a week. (N = 22). 2. Customary care: monthly visits to a psychiatrist who prescribed antipsychotic medication (N = 24).
Outcomes	Leaving the study early.** Unable to use ‐ Social functioning: Skill acquisition and generalisation* (no mean and SD). Mental state: UCLA Expanded BPRS (no mean and SD).
Notes	* Generalisation of skills to home environment. ** Two participants dropped out due to finding employment.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	"Randomised", no further details provided.
Allocation concealment (selection bias)	Unclear risk	No information given.
Blinding (performance bias and detection bias) All outcomes	High risk	Not stated.
Incomplete outcome data (attrition bias) All outcomes	High risk	"Two patients dropped out of skills training because they obtained full time employment and were thus unable to participate." No further details given.
Selective reporting (reporting bias)	High risk	Not all expected outcomes reported.
Other bias	Unclear risk	Protocol not available. Sample size not calculated.