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Table 2 Socio-demographic and medical background data on the study populationa

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 = 35,329 Mothers ≥ 45 n = 2229 P-value1 P-value2 P-value3 P-value4
min-max (mean/sd) min-max (mean/sd) min-max (mean/sd)
Maternal age, min-max (mean/sd) 14–39 (31.45/4.54) 40–44 (41.41/1.19) 45–55 (45.92/1.39) < 0.001 < 0.001 < 0.001 < 0.001
  n % n % n % P-value1 P-value2 P-value3 P-value4
Civil status        < 0.001 < 0.001 < 0.001 < 0.001
Married/ cohabiting 64,059 89.6 30,106 85.0 1802 80.8     
Single status at registration 7413 10.4 5323 15.0 427 19.2     
Parity        0.001 < 0.001 0.664 0.126
Primiparous 15,660 21.9 7417 20.9 497 22.3     
Multiparous 55,812 78.1 28,012 79.1 1732 77.7     
Worked during pregnancy        < 0.001 < 0.001 < 0.001 0.004
Unemployed/ student/ other 17,103 27.4 6418 20.8 454 23.9     
Full time 27,543 44.2 16,219 52.5 964 50.8     
Part time 17,717 28.4 8267 26.8 478 25.2     
Tobacco use during pregnancy        < 0.001 < 0.001 0.004 0.383
Yes 8329 12.3 3588 10.8 210 10.2     
Mother’s BMI (registration)        < 0.001 < 0.001 < 0.001 0.003
Normal 35,306 56.2 16,156 53.2 905 48.9     
Underweight 1165 1.9 291 1.0 21 1.1     
Overweight 17,117 27.3 9338 30.8 611 33.0     
Obese 9185 14.6 4566 15.0 314 17.0     
Chronic illnessb        0.725 0.890 0.440 0.422
Yes 15,035 21.0 7440 21.0 484 21.7     
ART        < 0.001 < 0.001 < 0.001 < 0.001
Yes 1894 2.6 2813 7.9 249 11.2     
  1. aNumbers may not add up to the total due to partially missing data
  2. be.g. Diabetes, Hypertension, Arthritis, SLE, Kidney disease, Epilepsy, Asthma, Ulcerative colitis
  3. 1Across all age groups
  4. 2≤39 vs. 40–44
  5. 3≤39 vs. ≥45
  6. 440–44 vs. ≥45