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Table 2 Temporal Changes in Neonatal Mortality by Plurality, Gestational Age and Subtype of Preterm Birth, United States, 1995-96 and 2004-05

From: Temporal trends in neonatal outcomes following iatrogenic preterm delivery

 

1995-96

2004-05

  

Plurality and gestational age and preterm birth subtype

Number of live births

Neonatal deaths/100 live births

Number of live births

Neonatal deaths/100 live births

Odds ratio (2004-05 vs 1995-96)

95% confidence intervals

Singletons

      

   24-27 wks: Iatrogenic

7,580

17.3

10,202

16.2

0.92

0.85-1.00

Spontaneous

10,295

19.7

8,865

16.5

0.80*

0.75-0.87

PROM

5,410

17.7

4,513

16.8

0.94

0.85-1.05

   28-31 wks: Iatrogenic

17,001

4.88

22,023

4.29

0.87*

0.79-0.96

Spontaneous

29,996

3.66

16,913

3.15

0.86*

0.76-0.96

PROM

9,181

3.67

7,351

3.14

0.85

0.72-1.01

   32-33 wks: Iatrogenic

17,938

2.55

25,068

2.96

0.76*

0.67-0.87

Spontaneous

26,093

1.62

23,136

1.41

0.87

0.75-1.01

PROM

11,292

1.30

9,075

1.27

0.97

0.76-1.24

   34-36 wks: Iatrogenic

101,903

0.88

168,239

0.67

0.75*

0.69-0.82

Spontaneous

206,090

0.48

205,518

0.36

0.75*

0.68-0.82

PROM

40,205

0.55

31,688

0.47

0.85

0.69-1.05

   24-36 wks: Iatrogenic

144,422

2.48

225,532

1.86

0.75*

0.71-0.78

Spontaneous

262,474

1.56

254,432

1.22

0.78*

0.74-0.81

PROM

66,088

2.51

52,627

2.38

0.95

0.88-1.02

Twins

      

   24-27 wks: Iatrogenic

1,953

20.1

3,305

17.7

0.86*

0.74-0.99

Spontaneous

1,955

25.3

1,685

19.8

0.73*

0.62-0.85

PROM

1,035

24.3

1,132

18.7

0.72*

0.59-0.88

   28-31 wks: Iatrogenic

4,607

3.30

8,144

2.74

0.83

0.67-1.02

Spontaneous

3,848

2.86

4,060

2.14

0.74*

0.56-0.99

PROM

2,149

2.75

2,333

2.53

0.92

0.64-1.32

   32-33 wks: Iatrogenic

6,290

1.95

12,076

0.64

0.67*

0.47-0.94

Spontaneous

5,799

0.47

5,798

0.50

1.07

0.64-1.82

PROM

2,195

0.68

2,575

0.78

1.14

0.58-2.23

   34-36 wks: Iatrogenic

29,476

0.42

57,447

0.26

0.63*

0.50-0.80

Spontaneous

24,862

0.32

23,054

0.20

0.64*

0.45-0.92

PROM

3,768

0.58

4,180

0.31

0.53

0.27-1.06

   24-36 wks: Iatrogenic

42,326

1.72

80,972

1.28

0.74*

0.67-0.82

Spontaneous

36,464

1.95

34,597

1.43

0.73*

0.66-0.82

PROM

9,147

3.79

10,220

2.97

0.78*

0.66-0.91

  1. *p-value < 0.05