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Table 8 Hospital mortality rate in the first year (d1-d365), in the neonatal (d1-d28) and the post-neonatal (d29-d365) periods, according to gestational age (GA) among 696 698 singleton live-born babies with GA ≥ 32 weeks of gestation (France, 2011)

From: Gestational age and 1-year hospital admission or mortality: a nation-wide population-based study

 

GA

Deaths

RR [95% CI]a

aRR [95% CI]b

aRR1 [95% CI]c

Number (‰)

First year mortality

32

25 (1.44)

21.7 [14.2–33.3]

21.9 [14.3–33.4]

3.8 [2.4–5.8]

33

34 (1.34)

19.9 [13.0–30.5]

19.9 [13.0–30.5]

3.4 [2.2–5.5]

34

31 (0.68)

10.2 [6.7–15.4]

10.3 [6.8–15.5]

1.8 [1.2–2.8]

35

35 (0.44)

6.4 [4.4–9.3]

6.5 [4.4–9.5]

1.5 [1.0–2.2]

36

43 (0.27)

4.1 [2.9–5.8]

4.2 [3.0–5.9]

1.6 [1.1–2.3]

37

64 (0.16)

2.5 [1.8–3.5]

2.6 [1.9–3.5]

1.8 [1.3–2.5]

38

80 (0.08)

1.3 [1.0–1.8]

1.4 [1.0–1.8]

1.2 [0.9–1.6]

39

108 (0.06)

1.0 [0.8–1.4]

1.0 [0.8–1.4]

1.0 [0.8–1.3]

40

107 (0.05)

41

66 (0.05)

0.9 [0.7–1.2]

0.9 [0.7–1.2]

0.9 [0.7–1.2]

42

4 (0.07)

1.2 [0.4–3.2]

1.2 [0.4–3.2]

1.2 [0.4–3.2]

43

1 (0.44)

6.9 [1.4–33.3]

7.0 [1.4–34.1]

6.6 [2.1–20.9]

Total

598 (0.86)

   

Neonatal mortality

32

19 (1.09)

29.1 [16.9–50.0]

29.5 [17.3-50.5]

5.1 [2.9–8.9]

33

19 (0.75)

20.9 [12.0–36.4]

21.1 [12.1–36.8]

3.5 [1.9–6.4]

34

21 (0.46)

11.7 [6.5–21.2]

12.0 [6.6–21.7]

2.2 [1.1–4.0]

35

28 (0.35)

10.0 [6.2–16.1]

10.1 [6.3–16.2]

2.1 [1.3–3.6]

36

34 (0.21)

6.1 [4.0–9.3]

6.2 [4.1–9.5]

2.3 [1.5–3.6]

37

34 (0.09)

2.4 [1.6–3.8]

2.5 [1.6–3.9]

1.8 [1.2–2.9]

38

40 (0.04)

1.3 [0.8–1.9]

1.3 [0.8–1.9]

1.1 [0.7–1.7]

39

48 (0.02)

0.9 [0.6–1.3]

0.9 [0.6–1.3]

0.9 [0.6–1.3]

40

54 (0.03)

41

39 (0.03)

1.1 [0.7–1.6]

1.1 [0.7–1.6]

1.1 [0.7–1.6]

42

3 (0.05)

1.7 [0.5–5.4]

1.7 [0.5–5.5]

1.7 [0.5–5.5]

43

1 (0.44)

12.3 [2.4–63.7]

12.6 [2.4–65.2]

12.0 [3.7–38.8]

 

Total

340 (0.48)

   

Post-neonatal mortalityd

32

6 (0.35)

12.7 [5.5–29.7]

12.6 [5.4–29.3]

2.1 [0.9–4.9]

33

15 (0.60)

21.5 [11.9–38.9]

21.1 [11.7–38.3]

3.25 [1.9–6.5]

34

10 (0.22)

8.1 [4.3–15.3]

8.0 [4.2–15.2]

1.4 [0.7–2.6]

35

7 (0.09)

3.2 [1.2–8.2]

3.2 [1.2–8.2]

0.7 [0.3–1.7]

36

9 (0.06)

2.0 [1.0–4.1]

2.0 [1.0–4.1]

0.7 [0.4–1.5]

37

30 (0.08)

2.8 [1.7–4.4]

2.8 [1.7–4.4]

1.8 [1.1–2.9]

38

40 (0.04)

1.4 [0.9–2.1]

1.4 [0.9–2.1]

1.2 [0.8–1.8]

39

60 (0.03)

1.1 [0.8–1.7]

1.1 [0.8–1.7]

1.1 [0.8–1.6]

40

53 (0.03)

41

27 (0.02)

0.8 [0.5–1.3]

0.8 [0.5–1.3]

0.8 [0.5–1.2]

42

1 (0.02)

0.6 [0.1–4.7]

0.6 [0.1–4.7]

0.6 [0.1–4.4]

43

0 (0.00)

NC

NC

NC

 

Total

258 (0.37)

   
  1. p (Somer’s D) < 0.001: significant trend for mortality rates according to gestational age
  2. aRR: relative risk
  3. baRR: relative risk adjusted for sex and pregnancy-related disease: ICD10 codes P01 and P02
  4. caRR1: relative risk adjusted for sex, pregnancy-related disease (ICD10 codes P01 and P02) and for hospitalization in the first 28 days of life
  5. dPopulation of singleton infants alive at d29: N = 696 358