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Table 1 Distribution by gestational age (GA) and sex among 696 698 singleton live-born babies ≥ 32 weeks of gestation (France, 2011)

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

GA Live-born babies Live-born boys Live-born girls Sex-ratioa
Number (%) Number (%) Number (%)
32 1741 (0.3) 961 (0.3) 780 (0.2) 1.23
33 2529 (0.4) 1400 (0.4) 1129 (0.3) 1.24
34 4552 (0.7) 2437 (0.7) 2115 (0.6) 1.15
35 7962 (1.1) 4322 (1.2) 3640 (1.1) 1.19
36 16 072 (2.3) 8659 (2.5) 7413 (2.2) 1.17
37 39 585 (5.7) 20 954 (5.9) 18 631 (5.4) 1.12
38 105 292 (15.1) 54 367 (15.4) 50 925 (14.8) 1.07
39 192 426 (27.6) 97 078 (27.5) 95 348 (27.7) 1.02
40 194 682 (27.9) 96 314 (27.3) 98 368 (28.6) 0.98
41 125 942 (18.1) 63 175 (17.9) 62 767 (18.3) 1.01
42 5688 (0.8) 2980 (0.8) 2708 (0.8) 1.10
43 227 (0.03) 129 (0.04) 98 (0.03) 1.32
TOTAL 696 698 (100%) 352 776 (50.6%) 343 922 (49.4%) 1.03
  1. p (Somer’s D) < 0.001: significant trend for the sex-ratio according to gestational age
  2. p (Chi square) test < 0.001: significant difference for the distribution of sex according to gestational age
  3. asex-ratio = number of live-born boys/number of live-born girls