Table 1.

The Robson 10-Group Classification System (TGCS) [13].

1	Nulliparous, singleton, cephalic, ≥37-week gestation, in spontaneous labor
2	Nulliparous, singleton, cephalic, ≥37-week gestation, induced (2a) or CS before (2b) labor
3	Multiparous (excluding previous CS), singleton, cephalic, ≥37-week gestation, in spontaneous labor
4	Multiparous (excluding previous CS), singleton, cephalic, ≥37-week gestation, induced (4a) or CS before (4b) labor
5	All multiparous women with a previous CS, singleton, cephalic, ≥37-week gestation
6	All nulliparous with a single breech pregnancy
7	All multiparous with a single breech pregnancy (including previous CS)
8	All multiple pregnancies (including previous CS)
9	All women with a single pregnancy in transverse or oblique lie (including previous CS)
10	All preterm singleton, cephalic, <37-week gestation pregnancies (including previous CS)