Socioeconomic differences in caesarean section – are they explained by medical need? An analysis of patient record data of a large Kenyan hospital

Table 6 Distribution of the study population according to the Robson Classification and C-section rates per Robson Group, for the total population and by SEP

	Total				Housewives				Small business				Professional				Student
Group^a	n in Robson Group	% of population in Robson Group %	C-section rate in Robson Group (%)	Contribution to CS rate of 16.5% (pp)^b	n in Robson Group	% of housewives in Robson Group	C-section rate in Robson Group (%)	Contribution to CS rate of 15.8% (pp)	n in Robson Group	% of Small Business in Robson Group	C-section rate in Robson Group (%)	Contribution to CS rate of 18.4% (pp)	n in Robson Group	% of Professional in Robson Group	C-section rate in Robson Group (%)	Contribution to CS rate of 21.1% (pp)	n in Robson Group	% of students in Robson group	C-section rate in Robson Group (%)	Contribution to CS rate of 13.8% (pp)
1&2	3757	31	13	4.1	1962	28	13	3.6	542	25	14	3.4	407	31	17	5.3	746	54	13	6.8
3&4	3308	27	7	1.9	2082	29	6	1.9	693	32	8	2.6	401	31	9	2.6	85	6	6	0.4
5	382	3	100	3.1	223	3	100	3.1	74	3	100	3.4	70	5	100	5.4	8	1	100	0.6
6	98	1	89	0.7	49	1	84	0.6	17	1	94	0.7	16	1	100	1.2	15	1	93	1.0
7	88	1	85	0.6	52	1	89	0.6	22	1	77	0.8	11	1	82	0.7	1	0	100	0.1
8	228	2	45	0.8	143	2	43	0.9	42	2	52	1.0	21	2	38	0.6	17	1	47	0.6
9	69	1	90	0.5	38	1	90	0.5	14	1	100	0.6	6	1	100	0.5	10	1	70	0.5
10	1163	10	15	1.4	714	10	14	1.4	203	9	17	1.6	84	6	14	0.9	144	11	13	1.4
11	1223	10	12	1.2	655	9	12	1.1	158	7	15	1.1	104	8	12	0.9	280	20	10	2.0
12	1622	13	14	1.9	1058	15	12	1.8	352	16	18	2.9	155	12	21	2.5	32	2	13	0.3
missing^c	271	2	13	0.3	153	2	13	0.3	44	2	9	0.2	29	2	24	0.5	37	3	8	0.2
Total	12,209	100	17	16.5	7129	100	16	15.8	2161	100	18	18.4	1304	100	21	21.1	1375	100	14	13.8

^aGroup:
1&2: Nullipara, singleton cephalic, 37+ weeks, spontaneous & induced labour
3&4: Multipara (excluding previous C-section) singleton cephalic, 37+ weeks, spontaneous & induced labour
5: Previous caesarean section, singleton cephalic, 37+ weeks
6: All nulliparous breeches
7: All multiparous breeches (including previous C-section)
8: All multiple pregnancies (including previous C-section)
9: All abnormal lies (including previous C-section but excluding breech)
10: All singleton cephalic, < 37 weeks (including previous C-section)
11: All nullipara, singleton cephalic, gestational age unknown (newly developed category)
12: All multipara, singleton cephalic, gestational age unknown (newly developed category)
^bpp.: percentage point; ^c 271 women could not be divided in one of the Robson groups (also not in newly developed category 11 or 12), because of missing information on parity (16 records), number of fetuses (236 records) or a combination of missing parity and number of fetuses (19 records)