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Table 2 Apgar scores, cord blood pHs (artery and vein), and percentages of NICU admission

From: Trends of preterm birth and low birth weight in Japan: a one hospital-based study

 

1997-2000

2001-2003

2004-2006

2007-2010

p value*

All births

  Apgar score 1, mean (SD)

7.8 (1.4)

7.9 (1.3)

8 (1.2)

8 (1.2)

<0.01

  Apgar score 5, mean (SD)

8.6 (0.9)

8.7 (0.9)

8.8 (0.8)

8.8 (0.7)

<0.01

  Umbilical artery pH, mean (SD)

7.30 (0.07)

7.31 (0.07)

7.30 (0.07)

7.30 (0.07)

<0.01

  Umbilical vein pH, mean (SD)

7.33 (0.07)

7.34 (0.08)

7.35 (0.07)

7.34 (0.07)

<0.01

  NICU admission (%)

809 (15.2)

602 (15.8)

522 (13)

745 (12.9)

<0.01

PTB

Separated by type

Medically indicated PTB, 37 wk

  Apgar score 1, mean (SD)

5.3 (2.8)

5.8 (2.7)

6.5 (2.4)

6.5 (2.4)

<0.01

  Apgar score 5, mean (SD)

7.6 (1.8)

7.5 (2.1)

8.3 (1.7)

8.2 (1.6)

<0.01

  Umbilical artery pH, mean (SD)

7.29 (0.11)

7.30 (0.09)

7.30 (0.10)

7.29 (0.09)

0.40

  Umbilical vein pH, mean (SD)

7.32 (0.10)

7.32 (0.09)

7.33 (0.1)

7.32 (0.10)

0.41

  NICU admission (%)

256 (84.5)

214 (85.3)

244 (72.8)

287 (72.1)

<0.01

Spontaneous PTB, 37 wk

  Apgar score 1, mean (SD)

7.1 (1.9)

7.3 (2)

7.3 (1.8)

7.3 (2.1)

0.74

  Apgar score 5, mean (SD)

8.1 (1.5)

8.4 (1.2)

8.6 (1.1)

8.5 (1.4)

<0.01

  Umbilical artery pH, mean (SD)

7.31 (0.08)

7.33 (0.08)

7.3 (0.10)

7.32 (0.08)

0.03

  Umbilical vein pH, mean (SD)

7.34 (0.09)

7.35 (0.09)

7.35 (0.13)

7.35 (0.10)

0.89

  NICU admission (%)

112 (62.6)

89 (59.7)

77 (54.6)

141 (66.5)

0.15

Separated by gestational week

PTB 34–36 wk

  Apgar score 1, mean (SD)

7.1 (1.9)

7.3 (1.9)

7.6 (1.6)

7.5 (1.7)

<0.01

  Apgar score 5, mean (SD)

8.3 (1.2)

8.5 (1.1)

8.7 (1.1)

8.7 (1)

<0.01

  Umbilical artery pH, mean (SD)

7.3 (0.1)

7.31 (0.08)

7.3 (0.08)

7.3 (0.07)

0.28

  Umbilical vein pH, mean (SD)

7.33 (0.09)

7.34 (0.09)

7.34 (0.1)

7.34 (0.08)

0.58

  NICU admission (%)

191 (63.2)

161 (63.6)

146 (53.7)

212 (57.8)

0.05

PTB 28–33 wk

  Apgar score 1, mean (SD)

4.6 (2.8)

5.4 (2.6)

6.6 (2)

6.3 (2.5)

<0.01

  Apgar score 5, mean (SD)

7.4 (1.6)

7.4 (1.9)

8.5 (1.4)

8.2 (1.5)

<0.01

  Umbilical artery pH, mean (SD)

7.31 (0.09)

7.32 (0.09)

7.31 (0.1)

7.3 (0.11)

0.52

  Umbilical vein pH, mean (SD)

7.33 (0.1)

7.33 (0.09)

7.34 (0.1)

7.33 (0.12)

0.95

  NICU admission (%)

142 (97.3)

117 (95.9)

112 (80)

157 (86.7)

<0.01

PTB 22–27 wk

  Apgar score 1, mean (SD)

2.7 (1.9)

2.6 (2.1)

3.8 (2.3)

3.7 (2.5)

<0.01

  Apgar score 5, mean (SD)

5.1 (2.4)

4.6 (2.5)

7.2 (2.6)

6.8 (2.4)

<0.01

  Umbilical artery pH, mean (SD)

7.28 (0.12)

7.32 (0.07)

7.28 (0.14)

7.28 (0.12)

0.59

  Umbilical vein pH, mean (SD)

7.28 (0.11)

7.31 (0.08)

7.31 (0.15)

7.29 (0.14)

0.78

  NICU admission (%)

38 (90.5)

28 (90.3)

68 (94.4)

63 (95.5)

0.65

LBW

  Apgar score 1, mean (SD)

6.7 (2.4)

6.9 (2.3)

7.1 (2.1)

7.2 (2.1)

<0.01

  Apgar score 5, mean (SD)

8.2 (1.5)

8.2 (1.6)

8.6 (1.4)

8.5 (1.3)

<0.01

  Umbilical artery pH, mean (SD)

7.30 (0.09)

7.31 (0.08)

7.30 (0.09)

7.30 (0.08)

<0.01

  Umbilical vein pH, mean (SD)

7.33 (0.09)

7.33 (0.09)

7.34 (0.10)

7.33 (0.09)

0.40

  NICU admission (%)

447 (59.4)

380 (64.3)

385 (55.7)

525 (57.8)

0.02

  1. LBW low birth weight; NICU neonatal intensive care unit; PTB preterm birth; SD standard deviation.
  2. *Obtained by the chi-square test or analysis of variance.