Brom 1989.

Methods	RCT with 4 parallel conditions
Participants	112 participants diagnosed with PTSD with DSM‐III criteria, with the condition that not more than 5 years had elapsed since the incurring event. Recruited through a general assessment with 1 of the study authors, and a further interview to ensure the participant could cope with a confronting therapy. Aged 18‐73 years (mean 42.0), 79% were women, 21% were men
Interventions	Intervention 1: trauma desensitisation (mean length of treatment 15.0 sessions) Intervention 2: hypnotherapy (mean 14.4 sessions) Intervention 3: brief psychodynamic therapy (mean length 18.8 sessions) based on Horowitz 1976 Control: wait‐list group (4 months long)
Outcomes	Pre‐, post‐ and 3 months post‐treatment. SCL‐90, with 5 subscales; STAI; State‐Trait Anger Inventory; Dutch Personality Questionnaire; Introversion‐Extroversion scale of the Amsterdam Biographical Questionnaire; scale for internal vs. external control
Notes	SCL‐90 total score and STAI data used in the review Unable to use personality data as it was reported only into subscales
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Comment: randomisation not described
Allocation concealment (selection bias)	Unclear risk	Comment: not described
Blinding (performance bias and detection bias) All outcomes	Low risk	Comment: self reports used (SCL90, STAI, Stait Trait Anger Inventory): low risk No psychotherapist was blinded to the treatment delivered Blinding participants to treatment group not possible
Incomplete outcome data (attrition bias) All outcomes	Low risk	Comment: even distribution of drop‐outs
Selective reporting (reporting bias)	Unclear risk	Comment: insufficient information to permit judgement. No published report on pre‐specified outcomes
Other bias	Unclear risk	Comment: insufficient information to permit judgement