Study design and setting
This explorative retrospective cohort study was conducted in Isala, a large teaching hospital in Zwolle, the Netherlands. Pregnant women treated in our hospital and women who were referred from primary care or regional hospitals to our hospital were included. The period of inclusion was from the introduction of national guidelines on the use of BDZs during pregnancy on 01-01-2013 until 31-12-2020 with a (poli)clinical delivery or puerperium in our hospital.