Cesarean delivery in Iran: a population-based analysis using the Robson classification system

Table 3 Cesarean Sections by the Robson classification system in Iran, 21 March 2019–21 March 2021

Group	Number of CS in group	Number of women in group	Obstetric population ^a (%)	CS rate ^b (%)	Absolute contribution ^c (%)	Relative contribution ^d (%)
1	129,245	390,791	16.8	33.1	5.6	10.8
2	246,619	366,822	15.8	67.2	10.6	20.6
2a	56,913	172,737	7.4	33	2.5	4.8
2b	189,706	194,085	8.4	97.7	8.2	15.8
3	34,807	553,021	23.8	6.3	1.5	2.9
4	40,504	174,464	7.5	23.2	1.7	3.4
4a	11,778	140,322	6	8.4	0.5	1
4b	28,726	34,142	1.5	84.1	1.2	2.4
5	564,782	574,218	24.7	98.4	24.3	47.1
6	35,618	37,419	1.6	95.2	1.5	3
7	21,549	24,347	1.1	88.5	0.9	1.8
8	30,974	35,175	1.5	88	1.3	2.6
9	4414	4574	0.2	100	0.2	0.4
10	90,579	161,669	7	56	3.9	7.5
Total	1,199,091	2,322,500	100 ^e	51.6	51.6	100 ^e

^a Obstetric Population (%) = n of women in the group / total N women delivered in the hospital ×100
^b CS rate (%) = n of CS in the group / total N of women in the group ×100
^c Absolute contribution (%) = n of CS in the group / total N of women delivered in the country × 100
^d Relative contribution (%) = n of CS in the group / total N of CS in the country × 100
^e The sum of the percentages may not be 100 due to errors introduced by rounding

ISSN: 1471-2393