Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT	39 women with idiopathic menorrhagia	Adverse effects 12 months 5/19 (26%) with combined oral contraceptive (norethisterone acetate 1 mg) 1/20 (5%) with ethinylestradiol 20 micrograms with a progestogen-releasing IUD	P value not reported