Study design, study population and data collection
This retrospective cohort study included all women who were diagnosed with placenta praevia at the time of their delivery at the Royal Brisbane & Women’s Hospital, one of the largest tertiary referral unit in Queensland, between 1st January 2009 and 31st December 2018. Women diagnosed with placenta accreta spectrum disorders (n=65) and duplicate records for those who gave birth to twins (n=11) were excluded, thus leaving 368 women for the analysis. This research was approved by the institutional Human Research Ethics Committee (LNR/2018/QRBW/43114). Data was retrieved via our institution-based obstetric database and review of patient charts. Surgeon operation notes and anaesthetic documentation were also carefully examined during the data retrieval period.