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Effectiveness of oral contraceptive pills in a large US cohort comparing progestogen and regimen
  1. Stephen Killick
  1. Professor of Reproductive Medicine and Surgery, University of Hull and Hull York Medical School, Hull, UK

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It is not easy to perform informative prospective studies of contraceptive failure. This paper refers to the most recent analysis of data from the International Active Surveillance Study of women taking oral contraceptives, which is a comprehensive 6-monthly follow-up of up to 5 years of pill users in multiple European countries and the USA.

The current analysis refers to a …

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  • Competing interests None.

  • Provenance and peer review Commissioned; internally peer reviewed.