Lewis 2006.

Methods	Allocation: random. Blinding: unstated. Duration: 90 days.
Participants	Diagnosis: axis I psychotic disorders (DSM‐IV). N=40. Sex: men. Inclusion: inmates with serious mental illness at a mental health housing unit at Osborn Correctional Institute, Somers Connecticut. Exclusion: people on mood stabilisers.
Interventions	1. Haloperidol: dose initiation 4 mg/day with weekly titration of 2 mg/day orally up to therapeutic maximum of 12 mg/day. N=20. 2. Risperidone: dose initiation 2 mg/day orally with weekly titration of 2 mg up to therapeutic maximum of 6 mg/day. N=20.
Outcomes	Aggression: OAS‐M administered weekly. Mental state (trait impulsivity): BIS at initiation and conclusion of study.
Notes	Conference proceeding, full characteristics and outcome data not reported.

N: number of participants.

Rating scale abbreviations: BIS: Barratt Impulsivity Scale; CGI: Clinical Global Impression; MOAS/OAS‐M: Modified Overt Aggression Scale; NOSIE: Nurses' Observation Scale for Inpatient Evaluation; PANSS: Positive and Negative Syndrome Scale.

Diagnostic standards abbreviations: DSM‐IV: Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition.