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Table 4 Perinatal status and pregnancy complications in neonatal gestational age strata

From: Estimation of high risk pregnancy contributing to perinatal morbidity and mortality from a birth population-based regional survey in 2010 in China

Gestational age (weeks)

<32

32-36

37-41

≥42

P values

All birthsa

302 (0.5)

1,937 (3.2)

56,331 (93.5)

1,694 (2.8)

 

Males

164 (54.8)

1,076 (56.0)

30,134 (53.8)

838 (49.7)

0.002

Gestational age (weeks)

29.8±1.8

35.3±1.3

39.8±1.0

42.4±0.5

<0.001

Birthweight (g)

1,727±709

2,572±562

3,475±442

3,596±443

<0.001

Low birthweight

258 (85.4)

844 (43.8)

572 (1.0)

6 (0.4)

<0.001

Multi-births

37 (12.3)

334 (17.2)

705 (1.3)

9 (0.5)

<0.001

Congenital anomalies

25 (8.4)

38 (2.0)

243 (0.4)

7 (0.4)

<0.001

Cesarean section

73 (24.6)

960 (49.8)

29,697 (52.8)

1,082 (64.0)

<0.001

Pregnancy complications

101 (34.0)

759 (39.3)

5,086 (9.1)

90 (5.3)

<0.001

Hypertension

12 (4.0)

127 (6.6)

855 (1.5)

17 (1.0)

<0.001

PROM

54 (17.9)

427 (22.0)

2761 (4.9)

40 (2.4)

<0.001

Anemia

4 (1.3)

60 (3.1)

667 (1.2)

14 (0.8)

<0.001

Maternal age (years)

26.9±6.3

26.7±5.9

25.8±5.1

25.1±5.0

<0.001

Delayed childbearing

45 (15.0)

262 (13.6)

4,601 (8.2)

125 (7.4)

<0.001

>9 years’ education

41 (15.4)

364 (21.4)

9,732 (18.6)

171 (10.8)

<0.001

Amniotic fluid volume

    

<0.001

Normal

242 (84.6)

1,651 (90.1)

51,189 (92.8)

1,484 (89.3)

 

Polyhydramnios

17 (5.9)

35 (1.9)

410 (0.7)

10 (0.6)

 

Oligohydramnios

27 (9.4)

147 (8.0)

3,561 (6.5)

168 (10.1)

 

Amniotic contamination

    

<0.001

Normal

239 (81.3)

1,679 (89.3)

48,041 (86.0)

1,295 (77.1)

 

Grade I

15 (5.1)

70 (3.7)

2,986 (5.3)

140 (8.3)

 

Grade II

5 (5.1)

56 (3.0)

2,543 (4.6)

121 (7.2)

 

Grade III

25 (8.5)

75 (4.0)

2,305 (4.1)

124 (7.4)

 

1-min Apgar ≤7

187 (64.5)

463 (24.3)

1,561 (2.8)

62 (3.7)

<0.001

1-min Apgar ≤3

98 (33.8)

99 (5.2)

143 (0.3)

5 (0.3)

<0.001

5-min Apgar ≤7

152 (52.4)

179 (9.4)

198 (0.4)

8 (0.5)

<0.001

5-min Apgar ≤3

80 (27.6)

75 (3.9)

72 (0.1)

4 (0.2)

<0.001

Hospitalized rate

208 (68.9)

1,445 (74.6)

4,961 (8.8)

123 (7.3)

<0.001

Oxygen therapy

156 (51.7)

656 (33.9)

966 (1.7)

36 (2.1)

<0.001

Mechanical ventilation

111 (36.8)

253 (13.1)

206 (0.4)

9 (0.5)

<0.001

Surfactant therapy

33 (10.9)

49 (2.5)

8 (0)

0 (0)

<0.001

Pneumonia

167 (55.3)

1,064 (54.9)

2,494 (4.4)

69 (4.1)

<0.001

Asphyxia

59 (19.5)

232 (12.0)

493 (0.9)

16 (0.9)

<0.001

RDS

92 (30.5)

183 (9.4)

90 (0.2)

0 (0)

<0.001

Deathsb

93 (30.9)

76 (4.0)

73 (0.1)

4 (0.2)

<0.001

  1. Values are given in numbers and percentage (% of all births in each gestational age category) or mean±SD. aPercentage of total numbers of all births, including fetal death/stillbirths and neonatal death at delivery (see Table 1); bincluding fetal deaths/stillbirth and neonatal deaths immediately at delivery but counted as live births.
  2. Abbreviations: PROM premature rupture of membrane; Apgar, Apgar score of life signs; RDS, respiratory distress syndrome.
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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