Method: All women giving birth vaginally at Landspitali University Hospital (in 2013 with 76% of births in the country) were enrolled in a quasi-experimental study. Data were recorded retrospectively in 2008-2010 and prospectively in 2012-2014, a total of 16.724 births.
Aðferð: Allar konur sem fæddu um leggöng á Landspítalanum, (76% allra fæðinga landsins árið 2013), á árunum 2008-2010 og árunum 2012-2014 voru þátttakendur í hálfstaðlaðri íhlutunarrannsókn, alls 16724 konur.