Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom severity
Systematic review	730 people 2 RCTs in this analysis	Mean difference in average Positive and Negative Syndrome Scale (PANSS) positive score at endpoint with olanzapine (7.5–30 mg/day) with ziprasidone (40–160 mg/day) Absolute results not reported	Mean difference –3.11 95% CI –4.30 to –1.93	Effect size not calculated	olanzapine
Systematic review	790 people 2 RCTs in this analysis	Mean difference in average PANSS negative score at endpoint with olanzapine (7.5–30 mg/day) with ziprasidone (40–160 mg/day) Absolute results not reported	Mean difference –0.68 95% CI –3.81 to +2.45		Not significant
Systematic review	529 people Data from 1 RCT	Mean difference in average PANSS cognitive score at endpoint with olanzapine (10–20 mg/day) with ziprasidone (80–160 mg/day) Absolute results not reported	Mean difference –2.40 95% CI –3.63 to –1.17	Effect size not calculated	olanzapine