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Table 1 Numbers and rates of perinatal death, live birth and small for gestational age (SGA) live birth among singletons births, Canada (excluding Ontario), 1991 to 1997.

From: Theory of obstetrics: An epidemiologic framework for justifying medically indicated early delivery

Gestational age

Stillbirths

Neonatal deaths

Live births

SGA live births

Rates (Conventional)

Fetuses at risk†

Rates (Fetuses at risk)

     

SGA (%)

Perinatal mortality per 1,000

 

Births per 1,000

R-SGA per 1,000

Perinatal mortality per 1,000

34

329

175

10661

1011

9.5

45.9

1583286

6.9

0.6

0.32

35

318

172

18128

1822

10.1

26.6

1572296

11.7

1.2

0.31

36

439

249

41962

4226

10.1

16.2

1553850

27.3

2.7

0.44

37

451

269

87566

9104

10.4

8.2

1511449

58.2

6.1

0.48

38

552

364

232039

22163

9.6

3.9

1423432

163.4

15.6

0.64

39

522

359

356922

35792

10.1

2.5

1190841

300.2

30.2

0.74

40

601

464

536302

54709

10.2

2.0

833397

644.2

65.9

1.28

41

304

219

245665

24104

9.8

2.1

296494

829.6

81.7

1.76

≥ 42

92

77

50433

5250

10.5

3.3

50525

1000.0

104.8

3.34

Total‡

8694

5562

1614531

160429

10.0

8.8

1623225

1000.0

100.0

8.70

  1. Note: Perinatal mortality includes stillbirths and neonatal deaths. Live births at each gestation served as the denominator for the conventional SGA rate and total births at each gestational week served as the denominator for conventional perinatal mortality rate. Under the fetuses at risk approach, birth, revealed SGA (R-SGA) and perinatal mortality rates were calculated using the number of fetuses at risk at that gestation as the denominator for the rate.
  2. † Calculated by summing the number of fetuses who delivered at that and subsequent gestational weeks.
  3. ‡ All gestational ages, including those < 34 weeks and those with missing gestational age.