Table 2.

Robson Classification among women with gestational weeks at delivery and mode of delivery information

Robson groupa	Description	Total number of deliveries	Size of each category (%)b	Robson reference for size of each categoryc	Number of cesarean deliveries	Cesarean delivery frequency in each category (%)d	Robson guideline for achievable/ acceptable ratee	Contribution of each category to cesarean delivery rate (%)f	Contribution of each category to total cesarean deliveries (%)g
1	Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labor	446	20.9	35–42%	242	54.3	< 10%	11.3	24.9
2	Nulliparous women with a single cephalic pregnancy, ≥ 37 weeks gestation who either had labor induced or were delivered by cesarean delivery before labor	248	11.6		66	26.6	20–35%	3.1	6.8
3	Multiparous women without a previous uterine scar, with a single cephalic pregnancy, ≥ 37 weeks gestation in spontaneous labor	549	25.7	30%	158	28.8	Around 3%	7.4	16.3
4	Multiparous women without a previous uterine scar, with a single cephalic pregnancy, ≥ 37 weeks gestation who either had labor induced or were delivered by cesarean delivery before labor	336	15.7		47	14.0	< 15%	2.2	4.8
5	All multiparous women with at least one previous uterine scar, with a single cephalic pregnancy, ≥ 37 weeks gestation	296	13.9	‒	290	98.0	50–60%	13.6	29.9
6	All nulliparous women with a single breech pregnancy	26	1.2	3–4%	26	100.0	‒	1.2	2.7
7	All multiparous women with a single breech pregnancy, including women with previous uterine scars	38	1.8		38	100.0	‒	1.8	3.9
8	All women with multiple pregnancies, including women with previous uterine scars	21	1.0	1.5–2%	19	90.5	Around 60%	0.9	2.0
9	All women with a single pregnancy with a transverse or oblique lie, including women with previous uterine scars	5	0.2	‒	5	100.0	‒	0.2	0.5
10	All women with a single cephalic pregnancy < 37 weeks gestation, including women with previous scars	172	8.0	< 5%	79	45.9	Around 30%	3.7	8.1
Total		2137	100.0		970		‒	45.4	100.0

^aWorld Health Organization guidelines for the Robson Classification advise that efforts to reduce cesarean delivery rates should be especially focused on reducing the rate in women in Robson group 1 (nulliparous women ≥ 37 weeks gestation singleton cephalic)

^bNumber of women in each category divided by the total number of women

^cWorld Health Organization Robson Classification Implementation Manual reference guideline for assessing the type of population. Adapted from: World Health Organization. Robson Classification Implementation Manual. Available at: https://www.who.int/publications/i/item/9789241513197. Last accessed on June 27, 2023

^dNumber of cesarean deliveries in the category divided by the number of women in the category. Values that are higher than the Robson guideline for achievable/acceptable rates are bolded

^eAdapted from: World Health Organization. Robson Classification Implementation Manual. Available at: https://www.who.int/publications/i/item/9789241513197. Last accessed on June 27, 2023

^fNumber of cesarean deliveries in each category divided by the total number of women

^gNumber of cesarean deliveries in each category divided by total number of cesarean deliveries