Brom 1989.

Methods	Randomised controlled trial
Participants	112 outpatients in the Netherlands. Various traumas, 89 bereaved. (88 women, 24 men)
Interventions	14 ‐ 18 sessions of trauma desensitisation (n = 31), hypnotherapy (n = 29), psychodynamic therapy (n = 29) or waiting list (n = 23) (data could not be entered into meta‐analysis, included only intrusion and avoidance sub‐scales)
Outcomes	"trauma symptoms" on SCL‐90
Notes	Therapists with over 10 years experience in the specific method. Therapists conducted the therapies they preferred outside the research setting (i.e. there were different therapists treating each treatment arm). Supervision sessions ensured adherence.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: The method of sequence generation is not reported. It is simply stated that treatment assignment was random.
Allocation concealment (selection bias)	Unclear risk	Comment: The method of sequence allocation is not reported,
Incomplete outcome data (attrition bias) All outcomes	High risk	Comment: There were no reported reasons for drop‐out. There was inadequate statistical correction for these drop‐outs. 3 individuals dropped out of each of the treatment arms.
Selective reporting (reporting bias)	Unclear risk	Quote: "We focus in this article on the data from the standardized questionnaires, disregarding the physiological and behavioral tests that were administered. The domains that were covered by the questionnaires were general symptoms, symptoms of the coping process, and personality." Comment: It is unclear whether it had originally been the intention to report the behavioural tests.
Other bias	High risk	Comment: Inadequate reporting of baseline characteristics. Each treatment arm had its own dedicated therapists (i.e. differences in outcome may have been attributable to expertise as opposed to the intervention).
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	Unclear risk	Comment: There is no mention of blinding outcome assessors.