Table 6 Maternal age related perinatal status and complications

Live births, n (%)^a

1,490 (2.5)

53,654 (89.1)

5,065 (8.4)

Males

761 (51.2)

28,667 (53.7)

2,763 (54.8)

0.054

Gestational age (weeks)

39.7±1.7

39.7±1.5

39.4±1.7

<0.001

Birthweight (grams)

3,329±478

3,442±485

3,465±552

<0.001

Preterm birth rate

74 (5.0)

1,847 (3.5)

307 (6.1)

<0.001

Low birthweight

56 (3.8)

1,406 (2.6)

214 (4.2)

<0.001

Multi-births

18 (1.2)

939 (1.8)

121 (2.4)

0.001

Congenital anomalies

5 (0.3)

273 (0.5)

33 (0.7)

0.245

Cesarean section rate

672 (45.1)

28,141 (52.6)

2,948 (58.3)

<0.001

Pregnancy complications

138 (9.3)

5,162 (9.6)

717 (14.2)

<0.001

Hypertension

15 (1.0)

795 (1.5)

200 (3.9)

<0.001

PROM

75 (5.0)

2,920 (5.4)

280 (5.5)

0.757

Anemia

17 (1.1)

637 (1.2)

89 (1.8)

0.002

Maternal age (years)

18.6±0.6

24.9±3.6

38.0±2.5

<0.001

>9 years’ education

62 (4.4)

9,827 (19.7)

401 (8.5)

<0.001

Amniotic fluid volume

0.005

Normal

1,344 (92.0)

48,608 (92.6)

4,568 (92.3)

Polyhydramnios

16 (1.1)

396 (0.7)

61 (1.2)

Oligohydramnios

101 (6.9)

3,490 (6.6)

318 (6.4)

Amniotic contamination

<0.001

Normal

1,245 (84.1)

45,731 (86.0)

4,245 (84.6)

Grade I

93 (6.3)

2,843 (5.3)

267 (5.3)

Grade II

84 (5.7)

2,412 (4.5)

234 (4.7)

Grade III

58 (3.9)

2,196 (4.1)

269 (5.4)

Apgar score

1-min ≤7

69 (4.6)

1,961 (3.7)

249 (4.9)

<0.001

1-min ≤3

14 (0.9)

280 (0.5)

52 (1.0)

<0.001

5-min ≤7

22 (1.5)

443 (0.8)

73 (1.5)

<0.001

5-min ≤3

13 (0.9)

181 (0.3)

40 (0.8)

<0.001

Deaths^b

10 (0.7)

203 (0.4)

34 (0.7)

0.002