Lateral episiotomy or no episiotomy in vacuum assisted delivery in nulliparous women (EVA): multicentre, open label, randomised controlled trial.

In the as treated population, obstetric anal sphincter injury occurred in 29 (8%) of 377 women with lateral episiotomy and 39 (12%) of 325 women with no episiotomy, which did not reach statistical significance (risk difference −4.3% (95% CI −8.9% to 0.2%)) (supplementary table S1).

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