The Association of Episiotomy with Obstetric Anal Sphincter Injury-A Population Based Matched Cohort Study

: Sari Räisänen, Tuomas Selander, Rufus Cartwright, Mika Gissler, Michael R. Kramer, Katariina Laine, Seppo Heinonen

Publisher: PUBLIC LIBRARY SCIENCE

: 2014

: PLoS ONE

: PLOS ONE

: ARTN e107053

: 9

: 7

: 1932-6203

DOI: https://doi.org/10.1371/journal.pone.0107053

Conclusions: A matched pair analysis showed a substantial reduction in the aORs of OASIS with episiotomy, due to confounding by indication. This indicates that results of observational studies evaluating an association between episiotomy and OASIS should be interpreted with caution.