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

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

  ART Spontaneous
≤39 40–44 ≥45 p-valueb ≤39 40-44 ≥45 p-valueb
n (%) n (%) n (%) n (%) n (%) n (%)
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)  
  1. aNumbers may not add up to the total due to partially missing data
  2. bPearson’s chi-square
  3. 1Appropriate for gestational age
  4. 2Small for gestational age
  5. 3Large for gestational age