Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Menstrual blood loss
RCT	162 women	Reduction in median menstrual blood loss 6 months –128.8 mL with progestogen-releasing IUD –17.8 mL with oral medroxyprogesterone	P <0.001	Effect size not calculated	progestogen-releasing IUD