Table 1.

Characteristics of our study population ($n=546$^a mother–son pairs of the French EDEN mother–child cohort).

Characteristics	$n$ (%)
Recruitment center
Poitiers	323 (59)
Nancy	223 (41)
Parity
Nulliparous	255 (47)
$\ge 1$	290 (53)
Missing	1 (0)
Maternal education
$\le 2\mathrm{y}$ after high school	226 (41)
High school $+2\mathrm{y}$	127 (23)
High school $+3\mathrm{y}$	186 (34)
Missing	7 (1)
Paternal education
$\le 2\mathrm{y}$ after high school	257 (47)
High school $+2\mathrm{y}$	118 (22)
High school $+3\mathrm{y}$	137 (25)
Missing	34 (6)
Household monthly income (euros)
$\le \mathrm{1,500}$	70 (13)
1,500–3,000	328 (60)
$\ge \mathrm{3,000}$	146 (27)
Missing	2 (0)
Smoking during pregnancy
No	419 (76)
Yes	125 (23)
Missing	2 (0)
Maternal psychological difficultiesb
No	394 (72)
Yes	152 (28)
Breastfeeding duration
Never	145 (27)
$\le 3\text{mo}$	221 (40)
3 mo	180 (33)
	Mean (SD)
Maternal age at pregnancy	29.7 (4.7)
Body mass index (${\mathrm{kg}/\mathrm{m}}^2$)	23.2 (4.5)

Note: SD, standard deviation; SDQ, Strength and Difficulties Questionnaire.

^aIncludes mother–son pairs that have biomarker assessments and SDQ scores at 3 or 5 years.

^bMaternal depression and/or maternal anxiety during pregnancy.