Potelunas 1982.

Methods	Allocation: randomised ‐ table of random numbers. Blindness: no (unclear if all raters were blinded). Duration: 6 weeks. Setting: outpatients*. Design: parallel. Country: USA.
Participants	Diagnosis: schizophrenia. N = 45. Sex: F 45. Age: mean ˜ 33 years (21‐25 years). History: volunteers, females, previous hospitalisation under the diagnosis of schizophrenia, participation in the program beyond five weeks.
Interventions	1. Social skills training: four one‐hour sessions over four weeks of videotaped presentation of eight problem situations, videotaped modelling, behaviour rehearsal, coaching and feedback (N = 15). 2. Discussion control: four one‐hour sessions over four weeks of videotaped presentation of eight problem situations, with discussion (N = 15). 3. No treatment control (N = 15).
Outcomes	Leaving the study early. Unable to use ‐ Overall rating form (invalidated due to problems in the administration of the form).** Supervisee Self Efficacy Test (not validated scale). Supervisee Social Competency Test (not validated scale). Nonverbal assertiveness scale (no overall score given).
Notes	* Psychiatrically disabled who are well enough to have been discharged from the hospital, but still needs some time in a supportive environment. ** Many of the supervisors were changed for the patients between pre and post tests, thus most of the forms were not filled out by the same supervisor for each patient. Social skills training was given as part of a work adjustment programme.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	A table of random numbers was used.
Allocation concealment (selection bias)	Unclear risk	No information provided.
Blinding (performance bias and detection bias) All outcomes	High risk	The primary experimenter was not seen by participants on a regular basis, but it is not stated whether they were blind to group allocation. Three research assistants blind to treatment condition independently rated the videotapes.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No information provided.
Selective reporting (reporting bias)	High risk	Not all expected outcomes reported.
Other bias	Unclear risk	Sample size calculation done. Source of funding not reported. Protocol not available.