Skip to main content

Advertisement

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