Data analyses
The identified outcomes were organised into an inventory based on the outcome measures and quality of the studies. The total number of individual outcomes and the frequency of each reported outcome were calculated and definitions of outcomes were analysed. The outcomes were reviewed to reduce duplication caused by different terminologies and similar outcomes were grouped together to create a clear and succinct outcome inventory. A narrative synthesis was performed in addition to the summative analysis. The outcomes were organised into broad categories: maternal and neonatal short-term and long-term outcomes and subsequent pregnancy outcomes. The short-term outcomes were defined as outcomes less than one year after delivery and long-term outcomes as one year or more.