| Code | Definition |
| 1 | Vaginally, spontaneous |
| 2 | Vaginally, forceps |
| 3 | Vaginally, vacuum |
| 4 | Vaginally, assisted (not further specified) |
| 5 | Vaginally, unknown |
| 9 | Unknown |
| 10 | Cesarean section, primary/elective (before onset of labour and rupture of membrane) |
| 11 | Cesarean section, Secondary |
| 12 | Cesarean section (not further specified) |