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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