Analysis of cesarean section rates using Robson ten group classification system in a tertiary teaching hospital, Addis Ababa, Ethiopia: a cross-sectional study

Table 3 Proportion of each Robson groups, CS rate in each group, and their relative and absolute contribution to overall CS rate at SPHMMC, Addis Ababa, Ethiopia, January-June 2018

Robson Group	Number of CS in group	Total number of women in group	Group size (%)^a	Group CS rate (%)^b	Absolute group contribution to overall CS rate (%)^c	Relative group contribution to overall CS rate (%)^d
Group 1	156	1,121	26.7	13.9	3.7	10.7
Group 2	267	368	8.8	72.6	6.4	18.3
2a	34	135	3.2	25.2	0.8	2.3
2b	233	233	5.6	100.0	5.6	16.0
Group 3	66	934	22.2	7.1	1.6	4.5
Group 4	231	327	7.8	70.6	5.5	15.8
4a	6	102	2.4	5.9	0.1	0.4
4b	225	225	5.4	100.0	5.4	15.4
Group 5	249	397	9.5	62.7	5.9	17.1
Group 6	48	94	2.2	51.1	1.1	3.3
Group 7	56	101	2.4	55.4	1.3	3.8
Group 8	95	176	4.2	54.0	2.3	6.5
Group 9	13	13	0.3	100.0	0.3	0.9
Group 10	278	669	15.9	41.6	6.6	19.1
Total	1,459	4,200	100	34.7	34.7	100

^aGroup size (%) = n of women in the group/total N women delivered in the hospital × 100
^bGroup CS rate (%) = n of CS in the group/total N of women in the group × 100
^cAbsolute group contribution (%) = n of CS in the group/total N of women delivered in the hospital × 100
^dRelative group contribution (%) = n of CS in the group/total N of CS in the hospital × 100

ISSN: 1471-2393