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Table 2 Perinatal mortality for singleton births in Norway 1987–1998 (n = 550 911) and 1999–2006 (n = 244 009) according to LMP-based gestational age and size at birth (small-for-gestational-age [SGA] and non-SGA)

From: Perinatal mortality by gestational week and size at birth in singleton pregnancies at and beyond term: a nationwide population-based cohort study

 

Non-SGA

SGA

Gestational age in weeks

Perinatal deaths n (per 1000)

Adjusted ORα

95% CI

Perinatal deaths n (per 1000)

SGA% of deaths per week

Adjusted ORα

95% CI

1987–1998

37

120 (6.1)

4.4

3.5–5.5

78 (36.8)

39.4

27.3

20.9–35.6

38

103 (2.1)

1.5

1.2–1.9

87 (16.3)

45.8

11.8

9.1–15.2

39

166 (1.6)

1.2

0.94–1.4

100 (8.8)

37.6

6.4

5.0–8.1

40

201 (1.4)

1.0

Reference

67 (4.4)

25.0

3.2

2.4–4.2

41

157 (1.4)

0.99

0.8–1.2

49 (4.3)

23.8

3.1

2.3–4.3

≥42

115 (1.7)

1.2

0.97–1.5

63 (9.3)

35.4

6.8

5.1–9.1

1999–2006

37

34 (3.7)

3.5

2.3–5.3

13 (16.6)

27.7

15.8

8.7–28.7

38

47 (2.0)

1.9

1.3–2.8

21 (11.5)

30.9

10.9

6.7–17.9

39

66 (1.4)

1.4

0.97–1.9

29 (8.8)

30.5

8.3

5.4–12.9

40

69 (1.0)

1.0

Reference

13 (3.3)

15.9

3.2

1.7–5.7

41

69 (1.3)

1.3

0.9–1.8

16 (5.6)

18.8

5.4

3.1–9.3

≥42

63 (2.0)

2.0

1.4–2.7

16 (10.2)

20.3

9.8

5.7–17.0

  1. Pregnancies with preeclampsia, pre-gestational and gestational diabetes and infants with congenital anomalies were excluded. For 1999–2006 smoking mothers were also excluded.
  2. αAdjustments by logistic regression where the following confounders were included: maternal age (<20, 20–24, 25–29, 30–34 and 35+), parity (para 0, para 1+) and fetal sex.