Definitions:
Meteor: The primary indication for a caesarean section being performed during a birth event, as represented by a code. NPDC: Main reason for caesarean section. Qld PDC: Main reason for caesarean section (ICD-10-AM).

Descriptions:
Meteor, NPDC, NMMD and WA: fetal compromise, suspected fetal macrosomia, malpresentation, lack of progress; less than or equal to 3cm cervial dilation, lack of progress in the first stage; greater than 3xm to less than 10cm cerival dilatation, lack of progress in the second stage, placenta praevia, placental abruption, vasa praevia, antepartum/intrapartum haemorrhage, multiple pregnancy, unsuccessful attempt at assisted delivery, cord prolapse, previous caesarean section, previous severe perineal trauma, previous shoulder dystocia, other obstetric, medical, surgical, psychological indications, maternal choice in the absence of any obstetric, medical, surgical, psychological indications, maternal choice in the absence of any obstetric, medical, surgical, psychological indications, not stated/inadequatelydescribed. NSW PDC: Main indication for CS tick boxes for failure to progress, fetal distress, elective repeat CS, other clinical and non-clinical indication. QLD PDC: Freetext for reason for CS. SA PDC: If LSCS state reasons (freetext). VIC PDC: Freetext field for indications for operative birth. TAS PDC: Indicate the reason(s) for caesarean section to be performed:  Maternal indications – Includes PET, other medical conditions and also patient requested caesarean section; Dystocia – Includes failure to progress (FTP) and cephalo-pelvic disproportion (CPD); Abnormal presentation – If caesarean section is performed because of any non-vertex presentation, e.g. breech, shoulder, brow or transverse; Fetal indications – Including abnormal CTG and or scalp pH, meconium staining of amniotic fluid, congenital abnormality, prematurity, multifetal gestation or cord complication; Failed induction – Where caesarean section is performed after induction of labour, and the active phase of labour is not reached, without another indication for caesarean section being present; Failed trial of instrumental delivery – Caesarean delivery after application of forceps and/or vacuum device, where vaginal delivery was not effected (includes failed application e.g. attempted application of Kiellands rotation forceps). ACT PDC: Indications for caesarean section, main and additional. NT PDC: Follows METeOR with some slight variation e.g. includes unsuccessful induction. QLD PMC: Main reason for caesarean (tick box list). TAS PMC: Indication for caesarean (tick box list).