One study highlighted that hyperactive ADHD is the most unstable form of the disorder in children. Astonishingly, over 90% of these young individuals no longer meet the same diagnostic criteria when reassessed in a follow-up study. This instability is a key indicator of the dynamic nature of ADHD in growing children.
Hyperactive ADHD not only shows the highest recovery rates but also the most frequent subtype shifts. This means that children initially diagnosed with hyperactive ADHD often transition to other ADHD subtypes or no longer fit the ADHD criteria at all.
Interestingly, in a study of 128 boys, hyperactivity and impulsivity symptoms were found to be more likely to improve compared to difficulties with attention. This finding is significant as it suggests that the hyperactive and impulsive components of ADHD are more responsive to change, whether through natural development or therapeutic interventions.
The stability of ADHD subtypes over a five-year period is relatively low to modest. It's reported to range from 11.1% to 35.3% for different subtypes. This lack of stability reinforces the notion that ADHD is not a static condition and can evolve over time, particularly during childhood and adolescence.
When looking at adults with ADHD, the combined subtype is the most common, followed by the inattentive subtype. The hyperactive/impulsive subtype, however, is least common among adults. This distribution aligns with the idea that hyperactive ADHD is indeed rare in adulthood, supporting the observation that this subtype is the least stable and most likely to change over time.
Severe symptoms of ADHD, along with the presence of other comorbid disorders like conduct disorder and major depression, are significant risk factors for the persistence of ADHD into adulthood. This underscores the complexity of ADHD as a condition influenced by a range of psychological factors.
The mental health of parents, particularly maternal psychopathology, has been shown to predict the persistence of ADHD into adolescence and young adulthood. The total number of parental mental health problems also adds to the risk for ADHD persistence. This connection between parental and child mental health further illustrates the multifaceted nature of ADHD.