Nasr 2013.

Methods	Parallel randomised controlled trial in university‐affiliated tertiary centre, Egypt Timing: Not stated
Participants	80 women randomised Mean age of unilateral drilling group was 28.4 ± 2.2 years and in bilateral group was 29.2 ± 1.9 years Inclusion criteria: Clomiphene‐resistant PCOS Exclusion criteria: No details
Interventions	Unilateral drilling (n = 40), versus Bilateral drilling (n = 40) 40 normally‐ovulating women were included as controls but not included in this review and were not randomised Follow‐up for 6 months
Outcomes	Serum anti‐Mullerian hormone at 6 months follow‐up
Notes	Conflict of interest: not stated Clinical trial registration number: not stated Conference abstract only
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "randomized" Comment: no other details
Allocation concealment (selection bias)	Unclear risk	No details
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No details
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No details
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	80 women randomised but not clear if all women were analysed at 6 months
Selective reporting (reporting bias)	High risk	Conference abstract that only reported on anti‐Mullerian hormone, which was not a prespecified outcome for this review
Other bias	High risk	States that groups were balanced at baseline but conference abstract only. No tables or P values identified