Moene 2002.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group Adequate power (evidence of power calculation): Quote: "A power of 80% and an alpha (two‐sided) of 5% showed that 25 patients would have been sufficient for each group in order to detect differences between groups with an effect size of d=0.8" Allocation concealment method: none described Blinding of outcome assessors: assessors were blinded Check of blinding: no information provided Duration of study: 1991–1996 Randomisation method: block randomisation using blocks with the following sized: 3 × 4, 2 × 6, 2 × 8, 2 × 4 and 2 × 2.
Participants	Baseline characteristics Intervention n: no information Control n: no information Overall n: 48 Duration of symptoms (mean): 3.9 (SD 4.5) years Age (mean): 36.8 (SD 11.31) years Sex (% woman): 77.3% Marital status currently married (%): 44.4% Educational status: 57.8% (technical or occupational education) Inclusion criteria: positive diagnosis of somatisation disorder with conversion symptoms of the motor type according to DSM‐III‐R criteria; duration of ≥ 1 month; aged 18–65 years; no problem speaking the Dutch language. Patients had to be available for full course of treatment and assessment sessions, and agree to received no other treatment during project and not to change their medication except when indicated and temporarily (e.g. temazepam 1 mg to sleep or oxazepam 20 mg during the day). Exclusion criteria: evidence of a neurological disorder explaining the conversion symptom; major affective disorder of the melancholy type or other severe psychiatric diagnosis requiring immediate treatment. Pretreatment: no statistically significant differences at baseline between groups. Diagnosis consistent with conversion disorder as specified in ICD‐10 or DSM‐IV
Interventions	Intervention characteristics Intervention Description: hypnotic treatment 8 weekly 1‐hour session+ TAU as inpatients + 1 initial treatment session. Also self‐hypnosis practice daily between sessions Length of treatment: 2 months Longest follow‐up after end of treatment: 6 months Comedications/other treatments while in the study: normal treatment for conversion disorder as inpatients (group therapy, physiotherapy and more) Control Description: 8 weekly 1‐hour session with a therapist, talking about non‐therapy specific issues. Homework was writing reflections on what had been talked about. Length of treatment: 2 months Longest follow‐up after end of treatment: 6 months Comedications/other treatments while in the study: normal treatment for conversion disorder as inpatients (group therapy, physiotherapy and more)
Outcomes	Severity of impairment (VRMC) Outcome type: continuous Mental state (SCL‐90) Outcome type: continuous Dropout Outcome type: dichotomous Data value: endpoint
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method used for randomisation was not provided.
Allocation concealment (selection bias)	Low risk	Allocation was concealed from the therapist and assessor.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not possible, due to the interventions believer.
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Allocation was concealed from the therapist and assessor.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Unclear dropout reporting in terms of total number of participants in each group at each stage.
Selective reporting (reporting bias)	High risk	Baseline demographic factors not stratified between groups.
Other bias	Low risk	No other apparent sources of bias.