Al‐Mizyen 2000.

Methods	Randomised controlled trial conducted in UK Timing: not stated.
Participants	21 women randomised (this may be a typographical error in the abstract). Mean age 27 and 28 years; mean duration of infertility was 5.0 versus 4.8 years and the mean BMI was 19 versus 17 kg/m2 Included: women with clomiphene‐resistant PCOS (150 mg clomiphene) with chronic anovulation, and 5 were resistant to FSH ovulation induction
Interventions	Bilateral ovarian surgery by diathermy (n = 10), versus Unilateral ovarian surgery (n = 11). LOS was performed with a diathermy needle creating 4 punctures/ovary 12 months follow‐up
Outcomes	Pregnancy rate (by participant)
Notes	Conflict of interest: not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "allocated randomly"; no other details in conference abstract
Allocation concealment (selection bias)	Unclear risk	No details in conference abstract.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No evidence of blinding of researchers, participants
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No evidence of blinding of outcome assessors
Incomplete outcome data (attrition bias) All outcomes	Low risk	All participants appear to have been followed through the study and all those randomised were analysed
Selective reporting (reporting bias)	High risk	No live birth data
Other bias	High risk	Conference abstract only