Li 2007a.

Methods	Allocation: random, no further details. Blindness: unclear. Duration: six months. Design: parallel. Location: inpatient, China.
Participants	Diagnosis: schizophrenia (CCMD‐3), PANSS of 60 or more. N = 60. Age: aripiprazole group: mean = (25.1 ± 6.8) years; clozapine group: mean = (26.4 ± 6.2) years. Gender: aripiprazole group: 13 male, 17 female; clozapine group: 15 male, 15 female. History: 2 years or less. aripiprazole group: mean = (5.7 ± 4.3) months; clozapine group, mean= (6.5 ± 4.8) years. Age at onset not reported.
Interventions	1. Aripiprazole: Dose range: 15‐30 mg/day. Mean dose:not reported. N = 30. 2. Clozapine: Dose range: 200‐350 mg/day. Mean dose:not reported. N = 30.
Outcomes	Mental state: PANSS total score, PANSS positive subscale score, PANSS negative subscale score, PANSS general pathology subscale score, anxiety ‐ labelled as "adverse effect''. Quality of life: WHOQOL100. Adverse effects.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Randomised, no further details.
Allocation concealment (selection bias)	Unclear risk	Not reported.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not reported.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Unclear if outcome was assessed blindly.
Incomplete outcome data (attrition bias) All outcomes	Low risk	No incomplete data.
Selective reporting (reporting bias)	High risk	Although TESS was used to assess adverse effects, no data on score were available. Data on use of anti‐psychotic drugs and benzhexol were missing.
Other bias	Low risk	None obvious.