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Table 3 Pregnancy and delivery outcomes for the study population

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

  Mothers ≤ 39 n = 71,472 Mothers 40–44 n = 35,429 Mothers ≥ 45 n = 2229 p-value1 p-value2 p-value3 p-value4
n % n % n %
Pre-eclampsia/eclampsia        < 0.001 < 0.001 < 0.001 < 0.001
Yes 1776 2.5 1365 3.9 146 6.6     
Gestational diabetes        < 0.001 < 0.001 < 0.001 < 0.001
Yes 935 1.3 917 2.6 86 3.9     
Gestational hypertension        < 0.001 < 0.001 < 0.001 0.017
Yes 679 1.0 549 1.5 49 1.2     
Premature contractions        0.008 0.011 0.055 0.169
Yes 229 0.31 82 0.2 2 0.1     
Infection        0.966 0.815 0.925 0.873
Yes 200 0.3 102 0.3 6 0.3     
Haemorrhage, prepartum        0.910 0.525 0.677 0.509
Yes 25 0.0 11 0.0 1 0.0     
Mode of delivery        < 0.001 < 0.001 < 0.001 < 0.001
Caesarean section (elective) 5328 7.5 4931 13.9 455 20.4     
Caesarean section (emergency) 4931 6.9 4249 12.0 370 16.6     
Instrumental deliveryb 3592 5.0 2255 6.4 118 5.3     
Epidural        < 0.001 < 0.001 < 0.001 0.001
Yes 14,454 20.2 6809 19.2 363 16.3     
Haemorrhage, intrapartum        < 0.001 < 0.001 < 0.001 < 0.001
Yes 1242 1.7 1206 3.4 124 5.5     
Haemorrhage, postpartum        < 0.001 < 0.001 < 0.001 0.010
Yes 3013 4.2 1658 4.7 131 5.9     
Paracervical block a        0.571 0.296 0.803 0.973
Yes 922 1.5 371 1.4 20 1.4     
Pethidine a        0.019 0.013 0.258 0.063
Yes 1738 2.8 667 2.5 47 3.3     
Pudendal block a        < 0.001 < 0.001 0.402 0.617
Yes 1446 2.4 771 2.9 38 2.7     
  1. aWomen delivered by caesarean section were excluded
  2. bVaginal delivery where either thongs or vacuum extraction was used
  3. 1Across all age groups, Person’s chi-square
  4. 2≤39 vs. 40–44, Pearson’s chi-square
  5. 3≤39 vs. ≥45, Pearson’s chi-square
  6. 440–44 vs. ≥45, Pearson’s chi-square