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. 2014 Oct 21;2014:0813.
Ref (type) Population Outcome, Interventions Results and statistical analysis Effect size Favours
Daily activities

RCT
115 women with primary dysmenorrhoea Reduction in total dysmenorrhoea score (composite measure of limited ability to work [score 0–3; from none/low efficacy to work to 1 or more day in bed] and need for analgesics [score 0–3; from none to taking analgesia for 3 or more days]) after 4 cycles
–2.6 with low-dose combined oral contraceptive pill (ethinyl estradiol plus norethisterone)
–1.4 with placebo

P <0.001
Effect size not calculated COC