Table 3

Characteristics of the study population according to gender in the children of the EDEN mother-child cohort study
Variables All (N = 1765) Boys (n = 918) Girls (n = 847) P*
Study centre, n (%)
  Poitiers 866(49.07) 490(53.38) 376(44.39) <0.01
  Nancy 899(50.93) 428(46.62) 471(55.61)
Family income (€/month), n (%)
  Low(≤1500) 262(14.84) 140(15.25) 122(14.40) 0.15
  Middle(1501–3000) 1001(56.71) 534(58.17) 467(55.14)
  High( >3001) 492(27.88) 237(25.82) 255(30.11)
Maternal education attainment, n (%)
  Less than high school 104(5.89) 55(5.99) 49(5.79) 0.97
  High school 683(38.70) 352(38.34) 331(39.08)
  College/University or more 950(53.82) 492(53.59) 458(54.07)
Maternal occupation, n (%)
  Blue-collar (laborers) 81(4.59) 49(5.34) 32(3.78) 0.24
  White-collar (occupations of intermediate, administrative, sales and customers and personal services) 1339(75.86) 688(74.95) 651(76.86)
  Professional (professional occupations, managers and senior officials) 217(12.29) 108(11.76) 109(12.87)
Maternal age at recruitment (years), (Mean ± SD) 30.64 ± 4.81 30.70 ± 4.81 30.58 ± 4.81 0.61
Maternal pre-pregnancy body mass index, n (%)
  Underweight (<18.50 kg/m2) 136(7.71) 74(8.06) 62(7.32) 0.80
  Normal (18.50-24.99 kg/m2) 1139(64.53) 597(65.03) 542(63.99)
  Overweight (25.00-29.99 kg/m2) 305(17.28) 156(16.99) 149(17.59)
  Obese (≥30.00 kg/m2) 149(8.44) 73(7.95) 76(8.97)
Cesarean delivery, n (%) 278(15.75) 162(17.65) 116(13.70) 0.02
Preterm birth, n (%) 428(24.25) 231(25.16) 197(23.26) 0.35
Birth weight (grams), (Mean ± SD) 3285.56 ± 506.65 3350.52 ± 529.41 3214.89 ± 470.89 <0.01
Breastfeeding, n (%)
  Never 795(45.04) 436(47.49) 359(42.38) 0.07
  ≤ 4 months 550(31.16) 279(30.39) 271(32.00)
  > 4 months 420(23.80) 203(22.11) 217(25.62)
Siblings, n (%) 962(54.50) 505(55.01) 457(53.96) 0.68
Family history of asthma, eczema, allergic rhinitis or food allergy, n (%) 912(51.67) 484(52.72) 428(50.53) 0.33

*P, the P-value for t-test or chi-square test between boys and girls;

SD, standard deviation;

Maternal gestational age < 37 weeks.

Zhou et al.

Zhou et al. BMC Public Health 2013 13:506   doi:10.1186/1471-2458-13-506

Open Data