Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
PTSD symptoms
Systematic review	19 people receiving SSRIs but not responding within the first 12 weeks of SSRI treatment Data from 1 RCT	Clinician-rated PTSD symptoms 10 weeks with olanzapine with placebo Absolute results not reported	SMD –0.92 95% CI –1.88 to +0.04		Not significant