Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptoms of PTSD
Systematic review	77 people Data from 1 RCT	Severity of PTSD symptoms (mean score on the Post-traumatic Stress Diagnostic Scale; lower score favourable) 2 weeks 6.94 with early group debriefing (within 10 hours) 33.10 with delayed group debriefing (after 48 hours)	P <0.001	Effect size not calculated	early group debriefing