Placental abruption
Placental abruption is a clinical diagnosis, identified by uterine tenderness, antepartum haemorrhage and/or foetal distresses (1, 2). The diagnosis in this study was based on coding according to the International Statistical Classification of Disease and Related Health Problems, 8th revision (1990-98) and 10th revision (1999 onwards) from the MBRN and included both partial and complete detachment of the placenta before delivery. The diagnosis was recorded by a check box or in open text on the standardized MBRN-notification form.