Zhang 1996 (CPZ).

Methods	Allocation: randomised. Blindness: no details. Duration: five weeks. Setting: no details.
Participants	Diagnosis: schizophrenia (CCMD‐2‐R). N=41. Sex: male and female. Age: mean ˜28 years. History: length of illness ˜8±7.5 years.
Interventions	1. Clozapine: dose 225 to 450 mg/d. N=20. 2. Chlorpromazine: dose 400‐750 mg/d. N=21.
Outcomes	Leaving the study early.
Notes	CSG: 8366
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Unclear risk	Randomised ‐ no details
Allocation concealment?	Unclear risk	No details
Blinding? All outcomes	Unclear risk	No details
Incomplete outcome data addressed? All outcomes	Low risk	No participants left the study early
Free of selective reporting?	Unclear risk	No details
Free of other bias?	Unclear risk	Unclear