The quality of evidence is downgraded by study quality, indirectness of the evidense, and imprecise results.
A network meta-analysis 1 included 9 studies with a total of 1205 subjects. Combined oral contraceptives were more efficacious than placebo in treating overall premenstrual symptomatology (standardized mean difference, 0.41; 95% credible interval, 0.17 to 0.67), but not premenstrual depressive symptoms specifically (standardized mean difference, 0.22; 95% credible interval, -0.06 to 0.47). There was no evidence for one combined oral contraceptive being more efficacious than any other.
Date of latest search: 26 August 2021
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