Skip to main content

Table 2 Characteristics of mothers and newborns in the entire cohort (n = 2002) vs. the study population (n = 1140)

From: Maternal diet before and during pregnancy and risk of asthma and allergic rhinitis in children

Variable Mean ± SD or frequency (%) P-value
n = 2002 n = 1140
Mothers
 Center, %
  Poitiers 48.35 55.26  
  Nancy 51.65 44.74 0.0002
 Age (years) mean ± SD 29.99 ± 4.89 30.59 ± 4.71 0.10
  < 25, % 15.08 11.07  
  25–34, % 68.99 70.74  
  > 34, % 15.93 18.19 0.04
 BMI (kg/m2), mean ± SD 26.32 ± 4.46 26.28 ± 4.47 0.69
  Normal, % 45.09 46.09  
  Overweight, % 37.82 37.03  
  Moderately obese, % 12.13 11.55  
  Severely obese, % 4.96 5.33 0.94
 Level of education, %
  Primary and below 7.56 4.54  
  Secondary 61.05 59.34  
  University and above 31.40 36.12 0.005
 Household income, %
  > 3000 euros/month 25.82 29.47 0.03
  Active smoking before pregnancy, % 36.72 30.93 0.001
 Smoking during pregnancy (active + passive), % 31.92 22.54 0.0001
 Maternal atopy 30.55 31.13 0.74
 Supplementation with vitamins and/or trace minerals, %
  During the year preceding pregnancy only 5.87 5.87  
  During the 3rd trimester of pregnancy only 49.70 49.10  
  During both periods 21.50 22.20  
  Never 22.94 22.83 0.98
 Duration of gestation (WA), mean ± SD 39.22 ± 1.75 39.22 ± 1.75 0.97
Newborns
 Sex (girl), % 47.45 46.67 0.67
 Birth weight (kg), mean ± SD 3.28 ± 0.59 3.29 ± 0.52 0.67
 Premature, % 5.77 6.05 0.75
 Number of older siblings, %
  0 48.60 48.25  
  1–2 46.95 47.63  
  ≥ 3 4.45 4.12 0.88
 Birth season, %    
  Summer 26.58 26.14  
  Autumn 22.22 22.54  
  Winter 21.03 22.28  
  Spring 30.17 29.04 0.82
  Exclusive breastfeeding ≥ 4 months, % 13.39 15.09 0.20
  1. SD standard deviation
  2. P-value: Chi squared test for categorical variables, Mann–Whitney U test for continuous variables; < 37 weeks of amenorrhea