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Table 4 Neonatal birth characteristics for the three study groupsa

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 40–45 n = 35,429 Mothers ≥ 45 n = 2229 CHI-SQUARE/ANOVA    
mean/SD mean/SD mean/SD p-value1 p-value2 p-value3 p-value4
Child’s length, cm (mean/SD) 50.34/ 2.65 50.27/ 2.85 49.85/ 3.30 < 0.001b < 0.001b < 0.001b < 0.001b
Child’s weight, gram (mean/SD) 3541.49/ 604.21 3507.06/ 639.68 3403.80/ 706.41 < 0.001b < 0.001b < 0.001b < 0.001b
  n % n % n % p-value1 p-value2 p-value3 p-value4
Twin        < 0.001 0.007 < 0.001 < 0.001
No 68,452 95.8 34,056 96.1 2033 91.2     
Yes 3020 4.2 1373 3.9 196 8.8     
Gestational age        < 0.001 < 0.001 < 0.001 < 0.001
Very preterm, < 32 weeks 680 1.0 436 1.2 54 2.4     
Preterm, 32–36 weeks 3870 5.4 2156 6.1 187 8.4     
Post term, > 42 weeks 245 0.3 127 0.4 8 0.4     
Birthweight        < 0.001 < 0.001 < 0.001 < 0.001
Low birthweight, 1500 g-2499 g 2633 3.7 1558 4.4 153 6.9     
Very low birthweight, < 1500 g 534 0.7 405 1.1 48 2.2     
Size for gestational age        < 0.001 < 0.001 < 0.001 0.884
AGA5 67,107 93.9 32,710 92.3 2052 92.1     
SGA6 1281 1.8 987 2.8 63 2.8     
LGA7 3084 4.3 1732 4.9 114 5.1     
Apgar 5        < 0.001 < 0.001 < 0.001 0.168
Low score, 0–6 763 1.1 546 1.6 43 1.9     
Apgar 10        < 0.001 < 0.001 < 0.001 0.015
Low score0–6 253 0.4 181 0.5 20 0.9     
Child healthc        < 0.001 < 0.001 < 0.001 < 0.001
Healthy – No 14,282 20.4 8422 24.3 602 27.7     
Survival        < 0.001 < 0.001 0.011 0.328
0–27 days 123 0.2 102 0.3 9 0.4     
  1. aStudent’s t-test
  2. bNumbers may not add up to the total due to partially missing data
  3. cDefined as: Healthy child, examined at the delivery ward
  4. 1Across all age groups
  5. 2≤39 vs. 40–44, Pearson’s chi-square
  6. 3≤39 vs. ≥45, Pearson’s chi-square
  7. 440–44 vs. ≥45, Pearson’s chi-square
  8. 5Appropriate for gestational age
  9. 6Small for gestational age
  10. 7Large for gestational age