Litz 2004.

Methods	Randomisation: 'Randomly assigned' Allocation concealment: Not yet known Exclusion after randomisation: Not yet known
Participants	Setting: US arm Inclusion: Platoons deployed on peacekeeping mission Exclusion: None reported
Interventions	Comparison: Critical incident stress debriefing (CISD) (Mitchell model) versus stress education versus survey only Time between event and intervention: Not reported
Outcomes	Post traumatic stress (PCL); Depression (CES‐D), General well‐being (GHQ); Aggressive behaviour; Marital satisfaction; Perceived Organisational Support; Morale.
Notes	Assessor blind to intervention: Unclear Assessment standardised:
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear