Table 3.

Relative changes in the cesarean section rates in Robson’s ten groups from 2004 to 2013

Year	2004	2005	2006	2007	2008	2009	2010	2011	2012	2013	Total	Chi square test for trends	P value
Total delivery	2717	2894	3410	3068	4461	3585	4931	3778	5171	6071	40,086
Vaginal delivery	2079	2283	2543	2391	3531	2737	3660	2807	3644	4318	29,993
Robson’s class
1	187	205	350	280	232	328	682	301	625	607	3797	60.951	<0.0001
2	20	20	40	49	29	44	35	47	54	89	427	10.117	0.0015
3	145	101	120	95	107	150	141	162	270	233	1524	25.98	<0.0001
4	10	14	21	19	9	20	10	16	10	30	164	9.6	0.0018
5	100	102	129	107	107	137	160	213	304	365	1722	124.312	<0.0001
6	50	53	59	38	48	72	48	54	68	99	589	3.06	0.0802
7	34	47	50	29	31	30	20	33	30	44	348	24.433	<0.0001
8	4	3	12	10	9	10	17	8	15	31	119	1.453	0.228
9	5	3	14	16	7	5	4	5	5	37	101	na	na
10	83	63	72	34	353	52	145	132	150	218	1302	0.0552	0.8143
Total	638	611	867	677	930	848	1262	971	1527	1753	10,093