Ghaly 1994.

Methods	Closed envelope system Losses to follow‐up: 10
Participants	Country: Scotland Number of participants: 100 (50 each group) Age: 21 to 55 Sex: F Inclusion criteria: > six months' pain, negative laparoscopy Exclusion criteria: previous malignant disease, mental retardation, medical treatment for pelvic pain at first visit, suspicion of malignant disease on pelvic examination, abnormal pelvic examination
Interventions	Treatments: US scan and education/counselling sessions Control: 'wait and see' policy (standard treatment) Duration: four to nine months' reassessment
Outcomes	McGill Pain Scale score: at least five‐point improvement Hospital Anxiety Depression Scale: improvement in category (normal, borderline, depressed)
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Not specified, quote: 'random allocation to groups'
Allocation concealment (selection bias)	Low risk	Closed envelope system
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not possible because of the nature of the study
Blinding of outcome assessment (detection bias) All outcomes	Low risk	Outcome assessed blind to allocation
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Of 100 randomly assigned, 10 failed to attend for follow‐up
Selective reporting (reporting bias)	Low risk	All outcomes reported
Other bias	Low risk	Nil