Mohammadi 2012.

Methods	Allocation: randomised. Blindness: unknown. Duration: 1 month. Design: parallel group.
Participants	Diagnosis: schizophrenia (DSM‐IV). History: unknown. N = 96. Age: mean 34.6 years, SD 8.05. Sex: 61 M, 35 F. Setting: inpatients.
Interventions	1. Active music therapy plus medication: playing music instruments, singing, body movements with music rhythms. 3 sessions per week for 4 weeks (12 sessions in total). N = 35. 2. 'Passive' music therapy plus medication: music listening. 3 sessions per week for 4 weeks (12 sessions in total). N = 27. Two music therapists implemented these two groups. 3. Neuroleptic medication. N = 34.
Outcomes	Mental state, negative symptoms: Scale for the Assessment of Negative Symptoms (SANS; Andreasen 1982). Mental state, positive symptoms: Scale for the Assessment of Positive Symptoms (SAPS; Andreasen 1984).
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	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 analyses
Other bias	Low risk	Adequate music therapy method: yes. Adequate music therapy training: yes. Music therapy was conducted by two music therapists. No personal, financial, or any other interests producing bias could be found.