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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