Ehlers 2005.

Methods	Randomised controlled trial
Participants	28 individuals with DSM‐IV PTSD in the UK. Various traumas.
Interventions	12 x weekly sessions of CT (n=14) vs WL (n=14)
Outcomes	CAPS, PDS, BDI, BAI
Notes	Therapist details/credentials are not reported and it is unclear whether treatment adherence was measured.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Patients were randomly allocated to either immediate cognitive therapy" Comment: The method of randomisation is clear.
Allocation concealment (selection bias)	Unclear risk	Comment: The method of allocation concealment was unclear.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: ITT analyses were performed.
Selective reporting (reporting bias)	Low risk	Comment: All specified outcomes were reported.
Other bias	High risk	Comment: Therapist details/credentials are not reported and it is unclear whether treatment adherence was measured.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comment: Participants were aware of their allocation.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote: Independent assessors were used.