Skip to main content

Table 1 Characteristics of the study population and the mother-son pairs of the French EDEN cohort

From: In-utero exposure to phenols and phthalates and the intelligence quotient of boys at 5 years

 

Study population

(N = 452)a

Mother-son pairs not in the study population

(N = 546)c

Pvaluesd

Characteristics

N

(%)

N

(%)

Recruitment center

 Poitiers

285

(63)

248

(45)

 

 Nancy

167

(37)

298

(56)

< 0.001

Parity

 Nulliparous

208

(46)

227

(41)

 

 ≥ 1

243

(53)

319

(58)

 

 Missing

1

(0.2)

  

0.15

Maternal education

 ≤ 2 years after high school

197

(44)

262

(48)

 

 High school + 2 years

105

(23)

114

(21)

 

 High school + 3 years

145

(32)

152

(28)

 

 Missing

5

(1)

18

(3)

0.22

Paternal education

 ≤ 2 years after high school

224

(50)

259

(47)

 

 High school + 2 years

97

(21)

91

(17)

 

 High school +3 years

104

(23)

112

(21)

 

 Missing

27

(6)

84

(15)

0.48

Household monthly revenue (euros)

 ≤ 1500

63

(14)

107

(17)

 

 1500–3000

275

(61)

296

(57)

 

 ≥ 3000

113

(25)

135

(25)

 

 Missing

1

(0.2)

8

(1)

0.04

Smoking during pregnancy

 No

348

(77)

383

(70)

 

 Yes

102

(23)

161

(29)

 

 Missing

2

(0.4)

2

(1)

0.01

Maternal psychological difficultiesb

 No

321

(71)

356

(65)

 

 Yes

130

(29)

186

(34)

 

 Missing

1

(0.2)

4

(1)

0.06

Was breastfeed

 Never

127

(28)

143

(26)

 

 Yes

325

(72)

396

(72)

 

 Missing

  

7

(1)

0.58

 

Mean

(SD)

Mean

(SD)

 

Maternal age at pregnancy

29.9

(4.7)

28.7

(5.0)

< 0.001

Total HOME score

17.3

(2.3)

17.0

(2.2)

0.14

Body Mass Index (kg/m2)

23.5

(4.6)

22.9

(4.5)

0.05

Child age at IQ assessment

5.7

(0.1)

5.7

(0.2)c

0.73

  1. Abbreviations: Home Home Observation Measurement of the Environment, IQ Intelligence Quotient
  2. aIncludes mother-child pairs with biomarker assessments and IQ scores at 5–6 years
  3. bMaternal depression or anxiety during pregnancy assessing using the CESD and the STAI respectively
  4. cIncludes boys for whom IQ was assessed N = 546
  5. dp-value for comparison between subjects with complete data for IQ and biomarker assessments and those missing either data or both generated using independent X2 and t-tests