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Table 1 Summary statistics of the participating children

From: Relationship between early language skills and the development of inattention/hyperactivity symptoms during the preschool period: Results of the EDEN mother-child cohort

  Mean (SD), min-max, or %
N = 1459
Male sex (vs. female) 52.1
Gestational age (weeks) 39.3 (1.7), 28–42
Birth weight (kg) 3.29 (0.50), 0.59–5.01
Maternal age at birth of child (years) 29.4 (4.8), 17–45
Tobacco consumption, % 22.8
Alcohol during pregnancy (drinks/week) 0.54 (1.46), 0–17
Breastfeeding duration (months) 3.4 (3.7), 0–13
Maternal depression during pregnancy, % 21.4
Maternal depression after birth, % 32.4
Family history of language delay, % 13.3
Household income (k€) 2.72 (1.01), 0.23–5.25
Parental education (years) 13.6 (2.3), 9–17
Number of older siblings 0.78 (0.94), 0–7
Maternal cognitive stimulation at 3 years 21.86 (4.84), 5–32
Score for family stimulation at 5.5 years 17.22 (2.29), 7–21
Recruitment center (Nancy) 47.6
Performance IQ 99.30 (13.78), 48–144
Language measures
At 3 years  
 Semantic fluency (ELOLA) 6.87 (3.91), 0–22
 Word and nonword repetition (ELOLA) 7.63 (3.22), 0–12
 Sentence repetition (NEPSY) 7.19 (3.30), 0–19
 Picture naming (ELOLA) 6.96 (1.90), 0–10
 Comprehension of instructions (NEPSY) 8.47 (2.98), 0–13
 Age of the child at the time of testing (months) 38.05 (0.81), 34.20–42.91
At 5.5 years
 Non Words Repetition (NEPSY) 28.03 (8.12), 5–45
 Sentence Repetition (NEPSY) 15.42 (4.10), 2–28
 Information (WPPSI-3) 24.96 (2.95), 12–32
 Vocabulary (WPPSI-3) 23.63 (5.65), 5–40
 Word Reasoning (WPPSI-3) 16.07 (4.69), 0–27
 Age of the child at the time of testing (months) 67.89 (1.85), 59.53–82.07
Strengths & Difficulties Questionnaires
At 3 years
 Emotional symptoms score 6.81 (1.63), 5–14
 Conduct problems score 6.20 (2.01), 3–12
 Hyperactivity/inattention symptoms score 4.48 (2.25), 1–12
 Peer relationship problems score 2.49 (1.50), 0–12
 Prosocial behavior score 12.71 (1.68), 7–15
At 5.5 years
 Emotional symptoms score 7.13 (1.88), 5–15
 Conduct problems score 5.37 (2.05), 2–13
 Hyperactivity/inattention symptoms score 4.07 (2.42), 0–13
 Peer relationship problems score 2.19 (1.33), 0–9
 Prosocial behavior score 13.37 (1.68), 7–15