Huang 2005.

Methods	Allocation: randomised. Blinding: single blind (assessor blind). Duration: 6 months. Setting: outpatients. Design: parallel. Country: China.
Participants	Diagnosis: schizophrenia (CCMD‐3). N = 73. Sex: M 48 F19*. Age: mean˜41years, SD˜7 years. History: current length of hospitalisation is at least 2 years, overall length of illness at least 10 years.
Interventions	1. Social skills training + routine drug medication, recreational activities and work in the wards: training is delivered in groups of 8‐9 people, 2 hours per weeks for 24 weeks. (N = 37) 2. Standard care: Routine drug therapy, recreational activities and work in the wards (N = 36).
Outcomes	Leaving the study early. Mental state: SANS. Social functioning: Scale of Social Skills for Psychiatric Inpatients (SSPI). Global state: No clinically important change (CGI).
Notes	In Chinese. * number who completed the study.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomised, no further details given.
Allocation concealment (selection bias)	Unclear risk	No information provided.
Blinding (performance bias and detection bias) All outcomes	High risk	Raters were blinded.
Incomplete outcome data (attrition bias) All outcomes	High risk	Four participants dropped out of the social skills training group and two from the control group. Dropouts were excluded from the final analysis.
Selective reporting (reporting bias)	Low risk	All stated outcomes reported.
Other bias	Unclear risk	Protocol not available. Sample size not calculated.