Roy 2009.

Methods	Prospective randomised trial conducted in India Timing: June 2005 to June 2007
Participants	44 women with PCOS, normal hysterosalpingography, normal semen parameters in partners; women were also clomiphene‐resistant. Mean age of women in unilateral group was 28.2 ± 12.7 and in the bilateral group was 28.8 ± 2.9 years Exclusion: Other causes of infertility like hypothalamic amenorrhoea, Cushing syndrome, premature ovarian failure, congenital adrenal hyperplasia, androgenic ovarian tumours, endometrial tuberculosis, abnormal TSH and prolactin; had already received other regimens of ovulation induction; tubal obstruction, extensive adhesions of the ovaries or fallopian tubes and endometriosis
Interventions	Unilateral laparoscopic drilling (n = 22), versus Bilateral laparoscopic drilling (n = 22) 5 drills performed per ovary. If there was no ovulation evident within 3 months, the women were started on clomiphene citrate 50 mg daily for 5 days increasing up to a maximum of 150 mg daily for 5 days for a maximum of 6 cycles Follow‐up for 1 year
Outcomes	Clinical and biochemical response, ovulation rate and pregnancy rate
Notes	No conflict of interest Clinical trial registration number: not stated
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "..randomly allocated.." Comment: No other details provided
Allocation concealment (selection bias)	Unclear risk	No details provided
Blinding of participants and personnel (performance bias) All outcomes	High risk	No evidence of blinding of researchers or participant
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	No details provided
Incomplete outcome data (attrition bias) All outcomes	Low risk	All women randomised appear to have been 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