Table 3 Sample characteristics for the 82 boys selected from the FRANCES sample.

From: Attention, cognitive control and motivation in ADHD: Linking event-related brain potentials and DNA methylation patterns in boys at early school age

Parameters

M ± SD/N (%)

Age (years)

7.54 ± 0.57

IQ44

104.5 ± 9.8

Socioeconomic status

11.4 ± 2.0

ADHD rating scale - total score45

0.64 ± 0.48

Prenatal risk factors:

  Maternal smoking

12 (14.6%)

  Alcohol exposure

18 (22.0%)

  Maternal depressive symptomatology

12 (14.6%)

  1. The socioeconomic status (sum index) was calculated on the basis of maternal and paternal secondary education level and family income (theoretical range: 3–14; higher values indicating higher status). Presence of prenatal risk factors maternal smoking (self-report: cutoff: 1 cigarette/day), prenatal alcohol exposure (meconium ethyl glucuronide; cutoff: 10 ng/g) and prenatal maternal depressive symptomatology (Edinburgh Postnatal Depression Scale, EPDS50; cutoff: 10) was not considered as an exclusion criterion.
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