Liu 2000.

Methods	Allocation: randomised (block procedure, block size of 4). Blindness: double. Duration: 12 weeks (preceeded by one week washout). Consent: written. Setting: hospital and outpatient clinic.
Participants	Diagnosis: schizophrenia (DSM‐II‐R). N=56. Age: mean ˜ 34 years. Sex: 15M, 23F*. History: average length of illness ˜ 8 years. Exclusions: other significant physical or psychological illness, substance abuse.
Interventions	1. Risperidone: dose unknown. N=28. 2. Haloperidol: dose unknown. N=28. Trihexyhenidyl, lorazepam, propanolol as required.
Outcomes	Mental state: PANSS. Adverse effects: ESRS. Leaving the study early. Unable to use ‐ CPT: outcome not relevant.
Notes	* Sex of those who completed the trial only.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear