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Table 2 Odds ratios for youngest and oldest parents relative to age 30y for mothers and age 35y for fathers

From: The risks of advancing parental age on neonatal morbidity and mortality are U- or J-shaped for both maternal and paternal ages

  Odds ratio for paternal age Odds ratio for maternal age
Age 15y Age 30y Age 65y Age 15y Age 35y Age 49y
Preterm delivery 1.31 (1.25, 1.39) 1 (baseline) 1.30 (1.20, 1.40) 1.22 (1.16, 1.30) 1 (baseline) 2.20 (2.00, 2.44)
Very preterm delivery 1.45 (1.31, 1.62) 1 1.39 (1.19, 1.62) 1.47 (1.32, 1.65) 1 2.00 (1.70, 2.35)
Small for gestational age 1.13 (1.07, 1.19) 1 1.46(1.35, 1.57) 1.60 (1.53, 1.67) 1 0.96 (0.88, 1.06)
Low Apgar score 1.42 (1.26, 1.62) 1 1.38 (1.16, 1.66) 1.41 (1.25, 1.61) 1 1.32 (1.09, 1.57)
Admission to NICU 1.19 (1.13, 1.25) 1 1.34 (1.24, 1.44) 1.12 (1.06, 1.18) 1 1.80 (1.64, 1.96)
Antibiotics 1.12 (1.05, 1.20) 1 1.17 (1.05, 1.30) 1.25 (1.18, 1.34) 1 1.22 (1.10, 1.38)
Surfactant 1.17 (1.05, 1.31) 1 1.14 (0.95, 1.36) 1.23 (1.08, 1.45) 1 1.67 (1.38, 2.12)
Prolonged ventilation 1.20 (1.10, 1.30) 1 1.13 (1.00, 1.29) 1.06 (0.97, 1.17) 1 1.76 (1.53, 2.06)
Seizure(s) 1.09 (0.82, 1.44) 1 1.32 (0.93, 2.27) 1.11 (0.94, 1.45) 1 1.13 (0.91, 1.62)
Death 1.17 (1.06, 1.31) 1 1.16 (1.00, 1.38) 1.48 (1.27, 1.77) 1 1.79 (1.42, 2.30)