Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Intraoperative and postoperative complications
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Uterine perforation 1/82 (1%) with bipolar radiofrequency 0/74 (0%) with hydrothermal ablation	RR 2.71 95% CI 0.11 to 65.54 P = 0.54		Not significant
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Saline leakage 0/82 (0%) with bipolar radiofrequency 3/74 (4%) with hydrothermal ablation	RR 0.13 95% CI 0.01 to 2.46 P = 0.17		Not significant
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Endometritis 2/42 (7%) with bipolar radiofrequency 5/31 (16%) with balloon ablation	RR 0.30 95% CI 0.06 to 1.42 P = 0.13		Not significant
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Bleeding 3/50 (6%) with ablative curettage 14/50 (28%) with over-curettage	RR 0.21 95% CI 0.07 to 0.70 P = 0.011 See Further information on studies	Moderate effect size	ablative curettage
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Infection/leukorrhoea 4/50 (8%) with ablative curettage 5/50 (10%) with over-curettage	RR 0.80 95% CI 0.23 to 2.81 P = 0.73 See Further information on studies		Not significant
Systematic review	Premenopausal women with heavy periods Data from 1 RCT	Uterine perforation 0/50 (0%) with ablative curettage 3/50 (6%) with over-curettage	RR 0.14 95% CI 0.01 to 2.70 P = 0.19 See Further information on studies		Not significant