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Table 1 Obstetric concepts and variables used to classify women in the 10-group or Robson classification.

From: WHO Global Survey on Maternal and Perinatal Health in Latin America: classifying caesarean sections

Obstetric concept Variable
Category of pregnancy Single cephalic pregnancy
  Single breech pregnancy
  Single oblique or transverse lie
  Multiple pregnancies
Previous obstetric history Nulliparous
  Multiparous without uterine scar
  Multiparous with uterine scar
Course of pregnancy Spontaneous labour
  Induced labour
  Caesarean section before labour
Gestation Gestational age in completed weeks at time of delivery