Evaluation of risk factors’ importance on adverse pregnancy and neonatal outcomes in women aged 40 years or older

Table 5 Birth characteristics and civil status by maternal age when giving birth and type of pregnancy ^a

	ART				Spontaneous
	≤39	40–44	≥45	p-value^b	≤39	40-44	≥45	p-value^b
	n (%)	n (%)	n (%)	p-value^b	n (%)	n (%)	n (%)	p-value^b
Civil status				< 0.001				< 0.001
Married/ cohabiting	1859 (98.2)	2651 (94.2)	227 (91.2)		62,200 (89.4)	27,455 (84.2)	1575 (79.5)
Single status at registration	35 (1.8)	162 (5.8)	22 (8.8)		7378 (10.6)	5161 (15.8)	405 (20.5)
Parity								< 0.001
Primiparous	872 (46.0)	1318 (46.9)	120 (48.2)	0.754	14,788 (21.3)	6099 (18.7)	377 (19.0)
Multiparous	1022 (54.0)	1495 (53.1)	129 (51.8)		54,790 (78.7)	26,517 (81.3)	1603 (81.0)
Twin				< 0.001				< 0.001
No	1404 (74.1)	2381 (84.6)	170 (68.3)		67,048 (96.4)	31,675 (97.1)	1863 (94.1)
Yes	490 (25.9)	432 (15.4)	79 (31.7)		2530 (3.6)	941 (2.9)	117 (5.9)
Gestational age				< 0.001				< 0.001
At term, 37–42 weeks	1556 (82.2)	2454 (87.2)	190 (76.3)		65,066 (93.6)	30,223 (92.8)	1787 (90.4)
Post term, > 42 weeks	4 (0.2)	11 (0.4)	1 (0.4)		241 (0.3)	116 (0.4)	7 (0.4)
Preterm, 32–36 weeks	277 (14.6)	284 (10.1)	49 (19.7)		3593 (5.2)	1872 (5.7)	138 (7.0)
Very preterm, < 32 weeks	57 (3.0)	64 (2.3)	9 (3.6)		623 (0.9)	372 (1.1)	45 (2.3)
Birthweight				< 0.001				< 0.001
Normal birthweight, ≥2500 g	1614 (85.5)	2526 (90.0)	193 (77.8)		66,533 (95.8)	30,834 (94.8)	1831 (92.6)
Low birthweight, 1500 g-2499 g	230 (12.2)	228 (8.1)	45 (18.1)		2403 (3.5)	1330 (4.1)	108 (5.5)
Very low birthweight, < 1500 g	44 (2.3)	52 (1.9)	10 (4.0)		490 (0.7)	1330 (1.1)	38 (1.9)
Size for gestational age				0.255				< 0.001
AGA¹	1788 (94.4)	2637 (93.7)	226 (90.8)		65,319 (93.9)	30,073 (92.2)	1826 (92.2)
SGA²	42 (2.2)	72 (2.6)	10 (4.0)		1239 (1.8)	915 (2.8)	53 (2.7)
LGA³	64 (3.4)	104 (3.7)	13 (5.2)		3020 (4.3)	1628 (5.0)	101 (5.1)

ISSN: 1471-2393