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Table 6 Post-neonatal admission (d29-d265) according to gestational age (GA) among 696 358 singleton babies still alive at d29 (France, 2011) (N = 84 301, 12.1%)

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

GA Hospitalized babies RR [95% CI]a aRR [95% CI]b aRR1 [95% CI]c
Number (%)    
32 727 (42.2) 3.6 [3.3–3.9] 3.6 [3.3–3.9] 2.2 [2.1–2.4]
33 781 (31.1) 2.7 [2.5–2.8] 2.6 [2.5–2.8] 1.6 [1.5–1.8]
34 1193 (26.3) 2.2 [2.1–2.4] 2.2 [2.1–2.4] 1.4 [1.3–1.5]
35 1706 (21.5) 1.8 [1.7–1.9] 1.8 [1.7–1.9] 1.3 [1.2–1.3]
36 2775 (17.3) 1.5 [1.4–1,5] 1.5 [1.4–1.5] 1.3 [1.2–1.3]
37 5840 (14.8) 1.3 [1.3–1.3] 1.3 [1.3–1.3] 1.2 [1.2–1.3]
38 13 544 (12.9) 1.2 [1.1–1.2] 1.2 [1.1–1.2] 1.1 [1.1–1.2]
39 22 599 (11.8) 1.1 [1.0–1.1] 1.1 [1.0–1.1] 1.1 [1.0–1.1]
40 21 326 (11.0)
41 13 187 (10.5) 0.9 [0.9–1.0] 0.9 [0.9–1.0] 0.9 [0.9–1.0]
42 584 (10.3) 0.9 [0.8–1.0] 0.9 [0.8–1.0] 0.9 [0.8–1.0]
43 39 (17.3) 1.5 [1.1–1.9] 1.5 [1.1–1.9] 1.5 [1.1–2.0]
Total 84 301 (12.1)    
  1. p (Somer’s D) < 0.001: significant trend for post-neonatal admission according to gestational age
  2. aRR: relative risk
  3. baRR: relative risk adjusted for sex, pregnancy-related diseases (ICD10 codes P01 and P02)
  4. caRR1: relative risk adjusted for sex, pregnancy-related diseases (ICD10 codes P01 and P02) and hospitalization in the first 28 days of life