Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Mean menstrual blood loss
Systematic review	48 women 2 RCTs in this analysis	Mean menstrual blood loss with NSAIDs with oral progestogens Absolute results not reported	WMD for blood loss –23.0 mL 95% CI –46.6 mL to +0.625 mL Analysis may have been underpowered to detect clinically important differences between treatments		Not significant