Abstract:Objective To identify modifiable and non-modifiable risk factors for
severe obstetric anal sphincter injury (OASI) following vaginal
delivery. Design Retrospective case-control study. Setting Single center
maternity clinic in South-Eastern Norway Population Women diagnosed with
OASI following singleton vaginal birth after 30 weeks’ gestation (n =
421) and matched controls (n = 421) during 1990-2002. Methods Data were
extracted retrospectively from an institutional birth registry. For each
woman with OASI the f… Show more
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