Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	Women with menorrhagia 3 RCTs in this analysis	Proportion of women with adverse effects 1 year 54/100 (54%) with progestogen-releasing IUD 28/101 (28%) with endometrial ablation	RR 0.51 95% CI 0.36 to 0.74 P = 0.00035	Small effect size	endometrial ablation
RCT	104 women with menorrhagia	Adverse effects 1 year with progestogen-releasing IUD (levonorgestrel) with transcervical resection of the endometrium Absolute results not reported	Between-group analysis not performed