Sharma 2006.

Methods	Randomised prospective pilot study, conducted in India Timing: not stated
Participants	20 women with clomiphene‐resistant PCOS, patent tubes on hysterosalpingography and normal partner semen. Average age of unipolar group was 27.3 (range 21 to 32), and for the bipolar group was 25.5 (range 23 to 30) years No exclusion criteria detailed.
Interventions	Unipolar (n = 10), versus Bipolar ovarian drilling (n = 10) The average number of punctures across both groups was 14.85 per ovary Follow‐up for 3 months and if no evidence of ovulation then started on clomiphene citrate
Outcomes	Ovulation and pregnancy rate, androgen and biochemical measurements
Notes	Conflict of interest: not stated Clinical trial registration number: not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "randomly assigned by using computerized random table"
Allocation concealment (selection bias)	Unclear risk	No details in paper
Blinding of participants and personnel (performance bias) All outcomes	High risk	No evidence of blinding of researchers or participants
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No details provided
Incomplete outcome data (attrition bias) All outcomes	Low risk	Although not stated it appears as though all women randomised were analysed
Selective reporting (reporting bias)	Unclear risk	We could not retrieve the original protocol. The outcomes listed in the Methods section were reported in the Results
Other bias	Low risk	No evidence of other risk of bias