ADHD symptoms and maturity--a study in primary school children

Area of Science:

• Developmental Psychology
• Pediatrics
• Child Psychiatry

Background:

• Attention deficit hyperactivity disorder (ADHD) is a common neurodevelopmental disorder.
• The etiology of ADHD is complex, with genetic and environmental factors implicated.
• The role of biological maturity as a potential factor in ADHD symptomatology requires further investigation.

Purpose of the Study:

• To investigate the association between age and non-behavioral measures of biological maturity with attention deficit hyperactivity disorder (ADHD).
• To determine if general biological immaturity is an etiologic factor in ADHD.

Main Methods:

• Screened 251 children aged 7-9 years in a Swedish school for ADHD symptoms.
• Assessed ADHD symptoms using the Conners Abbreviated Questionnaire (parent and teacher reports).
• Measured motor function, body weight, height, and estimated skeletal age via hand radiographs.

Main Results:

• Height, weight, and skeletal age correlated significantly with chronological age but not with ADHD symptom scores.
• Motor dysfunction showed a weak negative correlation with age.
• ADHD symptoms, as reported by parents and teachers, did not correlate with age or measures of biological maturity.

Conclusions:

• General biological maturity measures were strongly associated with age, but not with ADHD symptoms.
• Motor dysfunction and ADHD symptoms were not significantly associated with age.
• The findings do not support the hypothesis that general biological immaturity is a significant etiologic factor for ADHD.