Authors: Peyre H, Charkaluk ML, Forhan A, Heude B, Ramus F, EDEN Mother–Child Cohort Study Group
Eur J Paediatr Neurol. 2017 Mar;21(2):272-279
RATIONALE: The present study aims: (i) to determine how well developmental milestones at 4, 8, 12 and 24 months may predict IQ at 5-6 years old, (ii) to identify cognitive domains during the first two years that best predict later IQ and (iii) to determine whether children with IQ in the normal range at 5-6 years old may differ from disabled (IQÂ <Â 70) and gifted children (IQÂ >Â 130) with regard to their early cognitive development.
METHOD: The main developmental milestones were collected through self-administered questionnaires rated by parents at 4, 8, 12 and 24 months and through parental questionnaires administered by a trained interviewer and questionnaires completed following a medical examination at 12 months. These questionnaires were derived from the Brunet-LÃ©zine Psychomotor Development Scale and they addressed several cognitive domains (gross and fine motor skills, language and socialization).
RESULTS: (i) Developmental milestones predict a substantial part of the later IQ variance from 24 months (R(2)Â â¼Â 20%). (ii) Early language skills more strongly predict later IQ than the other cognitive domains. (iii) Several cognitive domains, but particularly language skills, predict disabled children at 5-6 years old (from the age of 8 months) and gifted children (from the age of 12 months).
DISCUSSION: The present study provides valuable information for early developmental assessment and could contribute to a better understanding of intellectual development.