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Table 2 Maternal characteristics, overall and by outcome (preterm birth (PTB), small for gestational age (SGA)), Metropolitan France, SNDS, 2015

From: Ability of municipality-level deprivation indices to capture social inequalities in perinatal health in France: A nationwide study using preterm birth and small for gestational age to illustrate their relevance

  Total PTB SGA
% n % n pa % n pa
N 726,497   7.5 54,378   11.9 86,305  
Maternal age (years)      0.004     < 0.001
  < 20 1.9 13,950 9.2 1,285   16,2 2,256  
  [20–25[ 12.4 89,934 7.7 6,877   13,7 12,290  
  [25–30[ 31.7 230,368 7.1 16,288   11,6 26,676  
  [30–35[ 33.4 242,236 7.0 17,032   11,2 27,208  
  ≥ 35 20.7 150,009 8.6 12,896   11,9 17,875  
CMU-C       < 0.001     < 0.001
 No 81.0 588,406 7.2 42,207   11,5 67,769  
 Yes 19.0 138,091 8.8 12,171   13.4 18,536  
Previous PTB       < 0.001    0.002
 No 97.0 704,345 7.1 50,092   11.8 83,529  
 Yes 3.0 22,152 19.4 4,286   12.5 2,776  
Previous SGA       < 0.001     < 0.001
 No 98.3 714,491 7.4 53,135   11.6 83,122  
 Yes 1.7 12,006 10.4 1,243   26.5 3,183  
Parity       < 0.001     < 0.001
 No 44.4 322,349 8.7 28,023   6.8 49,295  
 Yes 55.6 404,148 6.5 26,355   9.2 37,010  
obesity
(≥ 30)
      < 0.001     < 0.001
 No 95.0 689,894 7.3 50,646   11.4 82,509  
 Yes 5.0 36,603 10.2 3,732   10.4 3,796  
Previous tobacco consumption       < 0.001     < 0.0001
 No 90.5 657,501 7.2 47,460   10.0 72,594  
 Yes 9.5 68,781 10.0 6,903   19.9 13,679  
Previous hypertension       < 0.0001     < 0.001
 No 98.4 714,984 7.3 52,441   11.7 83,947  
 Yes 1.6 11,513 16.8 1,937   20.5 2,358  
Individual maternal deprivation       < 0.0001     < 0.0001
 No 98.1 713,062 7.4 52,924   11.8 84,235  
 Yes 1.9 13,435 10.8 1,454   15.4 20.7  
  1. aChi2 test