Ataoglu 2003.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group Adequate power (evidence of power calculation): none mentioned Allocation concealment method: no information Blinding of outcome assessors: participants were assessed by a psychiatrist who was unaware of the treatment group Check of blinding: none mentioned Duration of study: 6 weeks Randomisation method: computer
Participants	Baseline characteristics Intervention n: 15 Duration of symptoms: 34 days Age (mean): 23 (range 16–30) years Sex (% woman): 100% Educational status – no/primary school/high school: PI group consisted of 5 illiterates and 10 primary school graduates. Control n: 15 Duration of symptoms: 48 days Age (mean): 27 (range 18–35) years Sex (% woman): 93% Educational status – no/primary school/high school: diazepam‐treated group consisted of 3 illiterates, 11 primary school graduates, and 1 high school graduate. Overall n: 30 Duration of symptoms: 42 days Sex (% woman): 97% Inclusion criteria: people admitted to the emergency unit with pseudoseizure. The diagnoses were based on DSM‐IV criteria for conversion disorder. Exclusion criteria: abnormal EEG, organic disease, axis I or II disorder, previous psychiatric treatment Pretreatment: no statistically significant differences at baseline between groups
Interventions	Intervention characteristics Intervention Description: PI; 3 weeks as inpatients, with 2 daily session of PI Length of treatment: 3 weeks of inpatient treatment Longest follow‐up after end of treatment: 3 weeks Comedications/other treatments while in the study: none Control Description: diazepam 5–15 mg with appointments on days 10, 20, 30 and 45 of treatment to review their progress, to reinforce the use of diazepam, and to regulate the dosage. Length of treatment: 45 days Longest follow‐up after end of treatment: none Comedications/other treatments while in the study: none
Outcomes	Dropout Outcome type: dichotomous No conversion symptoms in last 2 weeks Outcome type: dichotomous Mental state – anxiety (HDRS) Outcome type: continuous
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "Finally, thirty patients (29 women and 1 man), diagnosed as conversion disorder were randomly divided into two groups by means of a computer."
Allocation concealment (selection bias)	Unclear risk	No information provided.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Quote: "Patients treated with diazepam were offered appointments at the days 10‐20‐30‐45 of treatment to review their progress, to reinforce the use of diazepam, and to regulate the dosage of diazepam." Quote: "The patients in the PI group were informed about the nature of the treatment, what was expected of them, and approximately how long the treatment would last. The relationship between."
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Quote: "All patients were assessed by a psychiatrist who was undisclosed to the subjects' group throughout the study."
Incomplete outcome data (attrition bias) All outcomes	Low risk	There were no dropouts.
Selective reporting (reporting bias)	Unclear risk	No protocol available.
Other bias	Low risk	No apparent sources of bias.