Table 2 Neonatal outcomes of live born singletons sorted by paternal age

Gestational age (week)

38.62 ± 1.51

38.64 ± 1.41

38.50 ± 1.52

38.36 ± 1.41

 < 0.001^a

Gestational age grouping

0.461^b

 Very preterm birth (< 32 weeks)

18 (0.7)

15 (0.4)

14 (0.7)

7 (0.6)

 Preterm birth (< 37 weeks)

132 (5.0)

218 (5.6)

128 (6.0)

63 (5.6)

 ≥ 37 weeks

2484 (94.3)

3653 (94.0)

1987 (93.3)

1046 (93.7)

Birthweight (g)

3345.0 ± 480.7

3350.2 ± 467.8

3337.4 ± 481.1

3309.4 ± 474.3

0.082^a

Z-scores

0.34 ± 1.01

0.34 ± 1.02

0.36 ± 1.00

0.30 ± 1.01

0.569^a

Birthweight grouping

0.176^b

 Very low birthweight (< 1500 g)

10 (0.4)

7 (0.2)

9 (0.4)

5 (0.4)

 Low birthweight (< 2500 g)

77 (2.9)

119 (3.1)

65 (3.1)

47 (4.2)

 Birthweight (2500–4000 g)

2367 (89.9)

3524 (90.7)

1933 (90.8)

1005 (90.1)

 High birthweight (> 4000 g)

180 (6.8)

236 (6.1)

122 (5.7)

59 (5.3)

Birthweight for gestational age

0.282^b

 Very small for gestational age (< 3rd percentile)

35 (1.3)

55 (1.4)

22 (1.0)

16 (1.4)

 Small for gestational age (< 10th percentile)

88 (3.3)

129 (3.3)

70 (3.3)

32 (2.9)

 Birthweight for gestational age (10th–90th)

2087 (79.2)

3052 (78.5)

1678 (78.8)

893 (80.0)

 Large for gestational age (> 90th percentile)

242 (9.2)

419 (10.8)

236 (11.1)

121 (10.8)

 Very large of gestational age (> 97th percentile)

182 (6.9)

231 (5.9)

123 (5.8)

54 (4.8)

Newborn gender

0.777^b

 Female

1373 (52.1)

2006 (51.6)

1100 (51.7)

595 (53.3)

 Male

1261 (47.9)

1880 (48.4)

1029 (48.3)

521 (46.7)