McClure 1992.

Methods	Single‐centre study, parallel‐group design with unclear blinding
Participants	38 women initially recruited for trial; mean age 42 years; from tertiary referral centre at University Department, Monash University 12 excluded before randomisation because of prior MBL measurements < 70 mL; 4 dropped out because of dissatisfaction with operative delay Inclusion criteria: Subjective diagnosis of menorrhagia unresponsive to medical therapy Normal cervical cytology MBL ≥ 70 mL (alkaline haematin method) Exclusion criteria: Fibroid enlargement Other intrauterine pathology Setting: tertiary referral centre, University department Timing: between May 1989 and July 1991
Interventions	All participants had pelvic examination and transvaginal ultrasonography Those randomised also received preoperative treatment with 10 mg MPA 3 times/d for 3 months to thin the endometrium Laser (argon) ablation (n = 12) TCRE + rollerball (n = 10) Duration: 6 months
Outcomes	• Reduction in MBL • Duration of surgery • Postoperative complications and requirement for analgesia • Need for further surgery • Amenorrhoea rate
Notes	No power calculation for sample size Source of funding: not stated Conflicts of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Method not stated
Allocation concealment (selection bias)	Unclear risk	Not reported
Blinding of participants and personnel (performance bias) All outcomes	High risk	Unlikely
Blinding of outcome assessment (detection bias) All outcomes	High risk	Unlikely
Incomplete outcome data (attrition bias) All outcomes	Low risk	No dropouts reported but very small study
Selective reporting (reporting bias)	Low risk	All prespecified outcomes reported
Other bias	Low risk	No evidence of other biases; source of funding not reported; groups appeared balanced at baseline