Risk factors and between-hospital variation of caesarean section in Denmark: a cohort study.

Objectives: The aim of this study was to estimate the effects of risk factors on elective and emergency caesarean section (CS) and to estimate the between-hospital variation of risk-adjusted CS proportions.

Design: Historical registry-based cohort study.

Settings And Participants: The study was based on all singleton deliveries in hospital units in Denmark from January 2009 to December 2012.