Ahlfors 1980.

Methods	Allocation: randomised, no further information. Blindness: double ‐ drugs given by a nurse not involved in trial. Setting: hospital, multi‐centre. Rating: reliablity study undertaken. Duration: 6 months ‐ preceeded by 1‐4 week wash‐out period.
Participants	Diagnosis: schizophrenia (Bleuler criteria). N=172. Sex: 114 M, 58 F. Age: 20‐65 years. Inclusion: 2+ years ill & poor response to present drugs or admitted for exacerbation of illness. Exclusion: somatic disease, pregnancy, drug or alcohol misuse, >65yrs.
Interventions	1. Zuclopenthixol decanoate: dose mean 280mg/IM, range 50‐800 mg/IM. N=87. 2. Perphenazine enanthate: dose mean 141 mg/IM, range 20‐600 mg/IM. N=85. Dose interval: 2/52. Other medications allowed: nitrazepam or chloral hydrate, amitryptiline, diazepam, biperiden.
Outcomes	Death. Global Impression (CGI). Relapse. Leaving the study early. Additional medication. Side effects (EPS). Unable to use ‐ Mental state (BPRS ‐ no SD, scores given as residual %). Behaviour (NOSIE‐36 ‐ no SD). Lab tests (no data).
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear