Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
Systematic review	Women with menorrhagia, total number of women randomised not reported Data from 1 RCT	Adverse effects with progestogen-releasing IUD (levonorgestrel) with hysterectomy Absolute results not reported
Systematic review	Women with menorrhagia, total number of women randomised not reported Data from 1 RCT	Proportion of women developing ovarian cysts 6 months 17/97 (18%) with progestogen-releasing IUD (levonorgestrel) 3/101 (3%) with hysterectomy	OR 4.93 95% CI 1.96 to 12.39 P = 0.0007	Moderate effect size	hysterectomy
Systematic review	Women with menorrhagia, total number of women randomised not reported Data from 1 RCT	Proportion of women developing ovarian cysts 12 months 17/79 (22%) with progestogen-releasing IUD (levonorgestrel) 8/101 (8%) with hysterectomy	OR 3.10 95% CI 1.33 to 7.24 P = 0.009	Moderate effect size	hysterectomy