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Table 3 Characteristics of the study population according to gender in the children of the EDEN mother-child cohort study

From: Modifiable exposures to air pollutants related to asthma phenotypes in the first year of life in 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

  1. * P, the P-value for t-test or chi-square test between boys and girls;
  2. SD, standard deviation;
  3. Maternal gestational age < 37 weeks.