Cha 2012.

Methods	Allocation: randomised. Blindness: unknown. Duration: 4 weeks. Design: parallel group.
Participants	Diagnosis: schizophrenia (DSM‐IV). History: unknown. N = 60. Age: unknown. Sex: unknown. Setting: inpatients.
Interventions	1. Receptive music therapy: song discussion, music reminiscence, musical synchronisation, and music and imagery. N = 30. 2. Standard care (medicine, health education and occupational and recreational therapy). N = 30.
Outcomes	Cognitive functioning, abstract thinking: Wisconsin Card Sorting Test (WCST; Heaton 1993). Cognitive functioning, memory: Clinical Memory Test (CMT; Xu 1986).
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomised, no details given
Allocation concealment (selection bias)	Unclear risk	No details given
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Due to the nature of the intervention it was not possible to blind those who received music therapy or those who delivered it.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No details given.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No attrition
Selective reporting (reporting bias)	Unclear risk	No study protocol available. All outcome measures described in the study were considered in the analysis.
Other bias	Low risk	Adequate music therapy method: yes. Adequate music therapy training: yes. No financial, personal or other interests producing bias detected.