Co-occurring medical and behavioural conditions in children with Down syndrome with or without ADHD symptom presentation.
Down syndrome children who screen positive for ADHD carry more sleep, allergy, and seizure problems—check these before you treat.
01Research in Context
What this study did
The team asked parents and teachers to rate children with Down syndrome. They split the kids into two groups: those who also showed ADHD signs and those who did not. Then they compared medical charts and behavior scores between the two groups.
What they found
Kids with DS plus ADHD signs had more sleep, allergy, seizure, and behavior disorders. Parents and teachers gave these kids higher hyperactivity and inattention scores. Age, IQ, and gender did not differ between the two groups.
How this fits with other research
Rice et al. (2015) first showed that a gene linked to dopamine predicts ADHD ratings in DS. Sasson et al. (2022) widen the lens by showing medical issues cluster with these same ratings.
Higgins et al. (2021) tested methylphenidate in DS+ADHD and found most kids improved. Their results extend J et al. by offering a treatment path once the medical picture is clear.
Panpan et al. (2025) found food allergy worsens ADHD and sleep in typical ADHD kids. J et al. echo this link inside the DS population, suggesting allergy screening is useful across groups.
Why it matters
If you assess a child with Down syndrome, add a quick allergy, sleep, and seizure checklist when ADHD symptoms appear. Share the list with the pediatrician before starting stimulants. Cross-setting rating scales remain essential because parent and teacher scores differ.
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02At a glance
03Original abstract
BACKGROUND: Co-occurring attention deficit hyperactivity disorder (ADHD) is a challenge to characterise in the presence of other medical conditions commonly present in children with Down syndrome (DS). The current study examined differences among children with DS with or without ADHD symptomatology in terms of demographics, developmental level, co-occurring medical conditions, and parent and teacher ratings of behaviour and executive functioning. METHODS: Parents and teachers of 108 school-age children with DS provided ratings of ADHD symptoms, behaviour problems and executive functioning skills. Children with DS and ADHD symptom presentation, as identified by a scoring algorithm, were compared with those without ADHD symptom presentation on demographic characteristics, developmental level, co-occurring medical conditions and parent-report and teacher-report measures of behaviours and executive functioning. RESULTS: Sleep disorders, disruptive behaviour disorder, allergies and seizures were more common in children with DS and ADHD symptom presentation than in children without ADHD symptom presentation. After controlling for ADHD medication use, children with DS and ADHD symptom presentation had poorer performance than those without ADHD symptom presentation on parent behaviour ratings, teacher behaviour ratings and parent but not teacher ratings of executive functioning. No significant group differences in demographic characteristics or developmental level were identified. CONCLUSIONS: Higher rates of co-occurring medical conditions present in children with DS and ADHD symptom presentation support the need for thorough differential diagnoses. The different pattern of group differences between parent-report and teacher-report has implications for diagnostic practices across settings as well as for treatment.
Journal of intellectual disability research : JIDR, 2022 · doi:10.1111/jir.12911