Table 4.

Robson’s classification system among women who gave birth at Hawassa University Referral Hospital, Hawassa, south Ethiopia, 2018–2019

Robson group	CS in group	Number in group	Group size (%)	CS in group (%)	Absolute group contribution to overall CS rate (%)	Relative contribution of the group to the overall CS rate (%)
Group 1 (nulliparous with singleton pregnancy in spontaneous labour)	301	1094	27.3	27.5	7.5	22.9
Group 2 (nulliparous women with singleton pregnancy who had induced labour or pre-labour CS)	97	227	5.7	42.7	2.4	7.4
Group 2a (induced labour)	55	185	4.6	29.7	1.4	4.2
Group 2b (pre-labour CS)	42	42	1.1	100	1	3.2
Group 3 (multiparous women without previous CS, with singleton pregnancy in spontaneous labour)	227	1356	33.9	16.7	5.7	17.3
Group 4 (multiparous without previous CS, singleton with induced labour or pre-labour CS)	68	158	3.9	43	1.7	5.2
Group 4a (induced labour)	33	123	3.1	26.8	0.8	2.5
Group 4b (pre-labour CS)	35	35	0.8	100	0.9	2.7
Group 5 (multiparous women with at least one previous CS)	281	362	9	77.6	7	21.4
Group 5.1 (one previous CS)	214	290	7.2	73.8	5.3	16.3
Group 5.2 (two or more previous CS)	57	72	1.8	79.2	1.4	4.3
Group 6 (nulliparous women with singleton breech)	38	46	1.2	82.6	0.9	2.9
Group 7 (multiparous women with singleton breech)	58	65	1.6	89.2	1.4	4.4
Group 8 (all multiple pregnancies)	91	154	3.9	59.1	2.3	6.9
Group 9 (all women with transverse or oblique lie)	16	16	0.4	100	0.4	1.2
Group 10 (all women with preterm delivery)	137	526	13.1	26	3.4	10.4
Total	1314	4004	100	32.8	32.8	100

Group size (%)=n of women in the group/total number of women who gave birth in the hospital×100.

Group CS rate (%)=n of CS in the group/total number of women in the group×100.

Absolute contribution (%)=n of CS in the group/total number of women who gave birth in the hospital×100.

Relative contribution (%)=n of CS in the group/total number of CS in the hospital×100.

CS, caesarean section.