Donnez 1994.

Methods	No. of centres: 1 Location: Catholic University of Louvain, Belgium Recruitment period: January 1990 to December 1990
Participants	Inclusion criteria: age < 35 yrs, infertility, laparoscopic confirmed ovarian endometriotic cysts (AFS moderate n = 41, AFS severe n = 39) Exclusion criteria: none No. randomised: 80 No. analysed: 80
Interventions	Medical therapy pre‐surgery 1. Goserelin S/C 4 weekly x 4 (n = 40) 2. No therapy (n = 40)
Outcomes	AFS scores: total, implants, adhesions, moderate, severe scores Ovarian cyst diameter Degree of active endometriosis as determined histologically from ovarian cyst wall biopsy
Notes	Power calculation: NS Funding: Fonds de la Recherche Scientifique
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"randomised according to official randomisation tables"
Allocation concealment (selection bias)	Unclear risk	not mentioned
Blinding (performance bias and detection bias) All outcomes	High risk	not mentioned, no placebo used
Incomplete outcome data (attrition bias) All outcomes	Low risk	all randomised patients included in outcome assessment
Selective reporting (reporting bias)	Unclear risk	AFS scores at second look laparoscopy ‐ no pregnancy data reported
Other bias	Low risk	groups appear comparable at baseline