Explanation of how the (Aberdeen) obstetric classification categories were amalgamated in this work
| Category | Comprised deaths due to: |
| Congenital anomalies | Neural tube defects |
| Other anomalies | |
| Pre-eclampsia | Pre-eclampsia without antepartum haemorrhaging |
| Pre-eclampsia complicated by antepartum haemorrhaging | |
| Antepartum haemorrhage | Antepartum haemorrhage with placental praevia |
| Antepartum haemorrhage with placental abruption | |
| Antepartum haemorrhage of uncertain origin | |
| Mechanical | Cord prolapsed or compression with vertex or face presentation |
| Other vertex or face presentation | |
| Breech presentation | |
| Oblique or compound presentation, uterine rupture, etc. | |
| Maternal disorder | Maternal hypertensive disease |
| Other maternal disease | |
| Maternal infection | |
| Miscellaneous | Isoimmunisation due to rhesus or other antigens |
| Neonatal infection | |
| Other neonatal infection | |
| Specific fetal condition | |
| Unexplained antepartum SGA | Unexplained antepartum (birth weight ≤10th centile) |
| Unexplained antepartum not SGA | Unexplained antepartum (birth weight >10th centile) |
| Unclassifiable | Unclassified |
| Missing |
SGA, small for gestational age.