A new study from Duke University has revealed that toddlers who later receive a dual diagnosis of autism and ADHD exhibit distinct behavioural characteristics, setting them apart from peers with only one of the conditions or no diagnosis at all. This new research highlights the importance of early identification and tailored intervention strategies for children with co-occurring neurodevelopmental disorders. The findings were published in The Journal of Child Psychology and Psychiatry.
The study followed 506 toddlers, observing their development from the ages of 16 to 38 months. Researchers found significant differences in behavioural patterns between the children later diagnosed with autism, those with ADHD, those with both, and those with neurotypical development. According to the findings, children with both autism and ADHD displayed higher levels of externalising and internalising behaviours, such as aggression, mood swings, and anxiety. They also demonstrated more pronounced autism-related behaviours, including difficulties with social interaction and communication.
Interestingly, the children with both autism and ADHD exhibited ADHD-related behaviours similar to those seen in children diagnosed with ADHD alone. However, the study highlighted that the co-occurring condition exacerbated the overall behavioural challenges. This combination of symptoms led to higher levels of parental stress, with parents of children diagnosed with both autism and ADHD reporting more significant challenges compared to those whose children had only one diagnosis.
One of the most critical takeaways from the research was the early manifestation of ADHD behaviours. The study found that these traits were evident as early as toddlerhood, often before an official diagnosis. This suggests that screening for ADHD during autism assessments could be beneficial, as it allows for earlier interventions. The researchers argue that incorporating ADHD assessments into routine autism screenings during early childhood could lead to more effective treatments that address both conditions simultaneously.
The co-occurrence of autism and ADHD has long been recognised, but previous research has focused mainly on school-aged children or adolescents. This study, however, is one of the few to examine the early childhood period, which is crucial for understanding how these conditions manifest and interact.
The research also explored the social-emotional functioning of the toddlers. It found that those with both autism and ADHD had higher overall behavioural problems than any other group in the study. These children struggled more with emotional regulation and social engagement, which may lead to difficulties in school and other social settings as they grow older.
Parental support was another area where the study highlighted distinct challenges for families. Parents of children with both autism and ADHD reported feeling overwhelmed by the demands of caregiving. They also expressed a need for more targeted resources, such as specific guidance on managing both sets of symptoms simultaneously.
While the findings underscore the need for early diagnosis and intervention, they also point to a broader issue in paediatric care. ADHD is often diagnosed later in childhood, even though symptoms can appear as early as the toddler years. The researchers suggest that paediatric guidelines should include more robust screening for both autism and ADHD during routine check-ups.
