Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom severity
[18] Systematic review	2044 people 17 RCTs in this analysis	Symptoms 2 to 9 weeks with benzodiazepines with placebo	Reported as significant Pooled mean effect size 0.70 CI not reported Measure of effect size not reported	Effect size not calculated	benzodiazepines
[30] Systematic review	People with anxiety disorders (total number of people not reported) 37 RCTs in this analysis	Anxiety with benzodiazepines with placebo	Reported as significant P value not reported	Effect size not calculated	benzodiazepines