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Table 1 Neonatal characteristics of the study infants by gestational age

From: Neonatal mortality and morbidity among infants between 24 to 31 complete weeks: a multicenter survey in China from 2013 to 2014

Gestational age

24 weeks

25 weeks

26 weeks

27 weeks

28 weeks

29 weeks

30 weeks

31 weeks

Total

Numbers (%)

11 (0.6)

25 (1.4)

33 (1.9)

79 (4.5)

199 (11.3)

321 (18.2)

444 (25.2)

648 (36.8)

1760 (100)

Males (%)

4 (36.4)

15 (60.0)

22 (66.7)

47 (59.5)

122 (61.3)

173 (53.9)

267 (60.1)

351 (54.2)

1001 (56.9)

Birth weight (g)

682.7 ± 99.6

799.6 ± 306.5

1022.8 ± 453.7

1004.2 ± 157.2

1179.7 ± 194.8

1306.8 ± 259.6

1639.9 ± 325.0

1828.5 ± 357.6

1463.0 ± 605.6

Multiple birth (%)

3 (27.3)

12 (48.0)

7 (21.2)

34 (43.0)

56 (28.1)

76 (23.7)

124 (27.9)

202 (31.2)

514 (29.2)

Caesarean section (%)

1 (9.1)

3 (12.0)

6 (18.2)

14 (17.7)

64 (30.7)

111 (34.6)

185 (41.7)

326 (50.3)

710 (40.3)

SGA (%)

0 (0)

4 (16.0)

1 (3.0)

2 (2.5)

10 (5.0)

18 (5.6)

37 (8.3)

44 (6.8)

116 (6.6)

5 min Apgar score <7 (%)

7 (63.6)

5 (20.0)

12 (36.4)

20 (25.3)

33 (16.6)

25 (7.8)

36 (8.1)

21 (3.2)

159 (9.0)

Antenatal care (%)

9 (81.8)

20 (80.0 %)

29 (87.9)

70 (88.6)

174 (87.4)

286 (89.1)

401 (90.3)

589 (90.9)

1578 (89.7)

Antenatal steroid use (%)

0 (0)

7 (28.0)

11 (33.3)

35 (44.3)

99 (49.7)

186 (57.9)

262 (59.0)

386 (59.6)

986 (56.0)

Complete antenatal steroid use (%)

0 (0)

3 (12.0)

5 (15.2)

17 (21.5)

48 (24.1)

115 (35.8)

159 (35.8)

221 (34.1)

568 (32.3)