Campfield 2001.

Methods	Randomisation: 'Randomly assigned' Allocation concealment: Not reported Exclusion after randomisation: no ITT: yes
Participants	Setting: Trauma Clinic Inclusion: Civilian victims of robbery in the workplace Exclusion: Victims of robberies involving physical injury, guns and those already receiving treatment for the effects of trauma
Interventions	Comparison: Immediate (<10hr) Critical incident stress debriefing (CISD) (Mitchell model) versus delayed CISD (>48 hrs) Time between event and intervention: <10 or >48 hrs
Outcomes	Post‐traumatic Stress Diagnostic Scale (PDS)
Notes	Assessor blind to intervention: Not stated Intervention standardised
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	D ‐ Not used