character:

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