Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom severity
Systematic review	4189 people 24 RCTs in this analysis	Hedges' adjusted g for mean difference in positive symptoms with olanzapine with first-generation antipsychotics Absolute results not reported	Mean difference –0.15 95% CI –0.21 to –0.09	Effect size not calculated	olanzapine
Systematic review	4187 people 24 RCTs in this analysis	Hedges' adjusted g for mean difference in negative symptoms with olanzapine with first-generation antipsychotics Absolute results not reported	Mean difference –0.32 95% CI –0.47 to –0.16	Effect size not calculated	olanzapine