Table 1.

Rate of Caesarean section by the Ten-Group Robson classification.

	Relative size of groups (% of total number of births)	CS rate in each group (% of number of women in each group)	Contribution made by each group to the overall CS rate %
(1) Nulliparous, single cephalic, ≥37 weeks, spontaneous labour	18.6%	58/489 (11.9%)	2.2%
(2) Nulliparous, single cephalic, ≥37 weeks	10.3%	76/270 (28.1%)	2.9%
(a) Induced	9.8%	63/257 (24.5%)	2.4%
(b) CS before labour	0.5%	13/13 (100%)	0.5%
(3) Multiparous, single cephalic, ≥37 weeks, spontaneous labour	34.4%	26/902 (2.9%)	1.0%
(4) Multiparous, single cephalic, ≥37 weeks	13.8%	60/361 (16.6%)	2.3%
(a) Induced	12.2%	20/321 (6.2%)	0.8%
(b) CS before labour	1.5%	40/40 (100%)	1.5%
(5) Previous CS, singleton cephalic, ≥37 weeks	14.3%	287/375 (76.5%)	10.9%
(a) Spontaneous labour	4.5%	54/119 (45.4%)	2.1%
(b) Induced	1.2%	9/32 (28.1%)	0.3%
(c) CS before labour	8.5%	224/224 (100%)	8.5%
(6) All nulliparous breeches	0.9%	21/23 (91.3%)	0.8%
(a) Spontaneous labour		5/6
(b) Induced		0/1
(c) CS before labour		16/16
(7) All multiparous breeches∗	1.1%	26/29 (89.7%)	1.0%
(a) Spontaneous labour		9/11
(b) Induced		0/1
(c) CS before labour		17/17
(8) All multiple pregnancies∗	1.4%	20/38 (52.6%)	0.8%
(a) Spontaneous labour		7/15
(b) Induced		3/13
(c) CS before labour		10/10
(9) All abnormal lies∗	0.5%	14/14 (100%)	0.5%
(a) Spontaneous labour		5/5
(b) Induced		4/4
(c) CS before labour		5/5
(10) All singleton cephalic, ≤36 weeks∗	4.7%	30/124 (24.2%)	1.1%
(a) Spontaneous labour		9/67
(b) Induced		3/39
(c) CS before labour		18/18
Total	100%	618/2685	23.5%

^∗Groups 7–10 include women with previous CS.