Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom severity
Systematic review	123 people Data from 1 RCT	<50% reduction in Positive and Negative Syndrome Scale (PANSS) negative symptom score with amisulpride (100–1000 mg/day) with ziprasidone (80–160 mg/day) Absolute results not reported	RR 0.95 95% CI 0.84 to 1.08		Not significant