Table 2.

Demographical and clinical characteristics of women delivering babies in 2008–2017 in two hospitals in Guangdong, China.

Characteristics		Longhua (N = 42,441)	Dongguan (N = 36,935)	P-value
Year of delivery	2008–09	6,497 (15.3)	8,395 (22.7)	<0.0001
	2010–11	7,782 (18.3)	8,403 (22.7)
	2012–13	9,229 (21.8)	7,962 (21.6)
	2014–15	8,913 (21.0)	6,141 (16.6)
	2016–17	12,020 (23.6)	6,034 (16.3)
Age (Years)	<35	38,915 (91.7)	33,926 (91.9)	0.41
	≥35	3,526 (8.3)	3,009 (8.1)
Education (Years)	<9	14,310 (33.7)	23,797 (64.4)	<0.0001
	≥9	28,131 (66.3)	13,138 (35.6)
Gestational age (Weeks)	28–33	472 (1.1)	521 (1.4)	<0.0001
	34–36	1,783 (4.2)	1,348 (3.7)
	≥37	40,186 (94.7)	35,066 (94.9)
Parity	Nulliparous	19,763 (46.6)	15,171 (41.1)	<0.0001
	Multiparous	22,678 (53.4)	21,764 (58.9)
	Without uterine scar	17,000 (75.0)	17,214 (79.1)	<0.0001
	Virginal delivery	15,480 (91.1)	14,931 (86.7)	<0.0001
	Cesarean birth	1,520 (8.9)	2,283 (13.3)
	With uterine scar	5,678 (25.0)	4,550 (20.9)
	Virginal delivery	1,639 (28.9)	832 (18.3)	<0.0001
	Cesarean birth	4,039 (71.1)	3,718 (81.7)
Modified Robson classification	Nulliparous, single, cephalic, ≥37 weeks	18,027 (42.5)	13,790 (37.3)	<0.0001
	Multiparous, single, cephalic, ≥37 weeks, without uterine scar	15,755 (37.1)	15,876 (43.0)
	Uterine scar, single, cephalic, ≥37 weeks	5,166 (12.2)	4,130 (11.2)
	Nulliparous, single, breech	579 (1.4)	551 (1.5)
	Multiparous, single, breech, including those with uterine scar	513 (1.2)	597 (1.6)
	All multiple pregnancies, including those with uterine scar	335 (0.8)	367 (1.0)
	All single, other abnormal lies, including hose with uterine scar	78 (0.2)	132 (0.4)
	All single, cephalic, ≤ 36 weeks, including those with uterine scar	1,988 (4.7)	1,492 (4.0)