May 9, 2024
Norway has a single-payer health insurance system that covers virtually the entire population and is linked to a series of national registries tracking all sorts of data including criminal records.
Using this data, a study team identified all 5,624 persons aged 10 to 18 diagnosed with ADHD between 2009 and 2011. It tracked their use of ADHD medication, and subsequent criminal charges.
Filled prescriptions were primarily for stimulant methylphenidate (90%) and the nonstimulant atomoxetine (9.5%). They tracked the cumulative number of daily defined doses (DDD) filled for any ADHD prescriptions following ADHD diagnosis.
They also compared this group with a general population sample of persons aged 10 to 18 without contact with mental health services, matched on age, sex, and geography.
They adjusted for the following confounders: age, sex, year of contact with clinic, psychiatric comorbidity at time of diagnosis, country of birth, charges before ADHD diagnosis, parents’ marital status, parent’s highest education when the child was 6 years, and parent’s labor income when the child was 6 years.
They further adjusted for municipality-level population size and high school dropout rates, and the following aggregated measures from the random sample of the general population: municipality-level labor income of parents and clinic-level percent of youth crime, youth immigrants, mothers’ marriage rate, and parents’ education level.
Comparing persons with ADHD to the matched general population over eight years follow-up, those with ADHD had considerably higher rates of criminal charges:
Next the team examined outcomes of pharmaceutical treatment.
Comparing persons with ADHD undergoing pharmacological treatment with those not receiving such treatment, those undergoing treatment had lower rates of certain criminal charges. At two years follow-up, those treated had 7.3% less violence-related charges. This corresponds to a number needed to treat (NNT) estimate of 14, indicating that on average treating 14 patients for two years avoids one violence-related criminal charge. Pharmacological treatment reduces public-order charges by at four years follow-up by 15.4% (NNT = 7), and any crime at three years follow-up by 18.5% (NNT = 5).
The authors noted, “Violence and public-order crimes are often caused by reactive-impulsive behavior which is more common in ADHD,” and concluded, “this is the first study to demonstrate causal effects of pharmacological treatment of ADHD on some types of crimes in a population-based natural experiment. Pharmacological treatment of ADHD reduced crime related to impulsive-reactive behavior in patients with ADHD on the margin of treatment, while no effects were found in crimes requiring criminal intent, conspiracy, and planning.”
Tarjei Widding-Havneraas, Henrik Daae Zachrisson, Simen Markussen, Felix Elwert, Ingvild Lyhmann, CandPsychol, Ashmita Chaulagain, Ingvar Bjelland, Anne Halmoy, Knut Rypdal, Arnstein Mykletun, “Effect of Pharmacological Treatment of Attention-Deficit/Hyperactivity Disorder on Criminality,” Journal of the American Academy of Child & Adolescent Psychiatry (2023), 4252, https://doi.org/10.1016/j.jaac.2023.05.025.
There has been consistent evidence of an association between ADHD and subjectively reported sleep problems even in patients not medicated for the disorder. There have also been studies using wrist-worn actigraphy (a wrist watch-like device that measures gross motor activity) and sleep lab-based polysomnography that measure objective sleep parameters.
What has been missing are large population-based cohort studies to explore the prevalence rates of different sleep disorders and medical prescriptions in ADHD.
Methods Used:
Sweden has a single-payer health insurance system and a series of national population registers that track virtually its entire population. Using the Swedish Total Population Register, a local research team created a cohort of all 6,470,658 persons born between 1945 and 2008. They linked this to the Swedish National Patient Register, which includes inpatient hospitalizations from 1975 to 2013, and outpatient specialist diagnoses from 2001 to 2013, to identify diagnoses of sleep disorders. They also linked to the Prescribed Drug Register, covering 2005 to 2013, to identify prescriptions for sleep medications.
Summary of Findings:
Overall, persons with ADHD were eight times more likely to be diagnosed with any sleep disorder relative to normally developing peers. Broken down by age, adolescents with ADHD were 16 times more likely to receive such diagnoses, young adults (18-30) twelve times more likely, children and mid-age adults (31-45) eight times more likely, and older adults six times more likely.
Broken down by specific sleep disorder diagnoses, relative to normally developing peers, persons with ADHD were:
As for sleep medication, relative to normally developing peers, persons with ADHD were:
Conclusion:
The team concluded, “Our findings also suggest that greater clinical attention should be directed towards addressing sleep problems in individuals with ADHD. This entails implementing proactive measures through sleep education programmes and providing both pharmacological and non-pharmacological approaches such as cognitive behavioural therapy and parental sleep training.”
Attention is a critical determinant of academic achievement, influencing domains such as language, literacy, and mathematics. To explore whether physical activity can improve attention in children with ADHD, an international team conducted a meta-analysis of peer-reviewed studies. The goal was to evaluate the impact of various physical activity regimens on attention-related outcomes in this population.
The researchers performed a comprehensive search of the medical literature to identify studies examining the effects of physical activity on attention in schoolchildren with ADHD. They included 10 studies with a total of 474 participants in their meta-analysis. The studies evaluated two main types of physical activity:
Additionally, they examined variations based on the frequency, duration, and type of control groups used in the studies. To assess consistency, they also analyzed heterogeneity (variability of outcomes) and checked for potential publication bias.
Key findings from the meta-analysis include:
The authors concluded that mentally engaging exercise is more effective than aerobic exercise in improving attention problems in schoolchildren with ADHD. Furthermore, higher frequency and longer duration of physical activity do not necessarily yield better outcomes.
This research underscores the importance of tailoring physical activity interventions to emphasize cognitive engagement over intensity or duration. By refining strategies, educators and parents can better support children with ADHD in achieving academic success. But take note: given the results from controlled studies, it seems clear that if there is a positive effect of exercise, it is very small so should not replace standard treatments for ADHD.
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Previous studies have examined how stimulant medications affect the brain in controlled settings, but less is known about their impact in real-world conditions, where children may not always take their medication consistently or may combine it with other treatments. A new study leverages data from the Adolescent Brain Cognitive Development (ABCD) study to explore how real-world stimulant use impacts brain connectivity and ADHD symptoms over two years.
Changes in Brain Connectivity Researchers used brain imaging data from the ABCD study to examine the functional connectivity—communication between brain areas—of six regions within the striatum, a brain area involved in motivation and movement control. They focused on how stimulant use influenced connectivity between the striatum and other networks involved in executive functioning and visual-motor control.
The study found that stimulant exposure was linked to reduced connectivity between key striatal areas (such as the caudate and putamen) and large brain networks, including the frontoparietal and visual networks. These changes were more pronounced in children taking stimulants compared to those who were not medicated, as well as compared to typically developing children. Importantly, this reduction in connectivity seemed to regulate certain brain networks that are typically altered in children with ADHD.
Symptom Improvement In addition to brain changes, 14% of children taking stimulants experienced a significant reduction in ADHD symptoms over the two-year period. These children showed the strongest connectivity reductions between the right putamen and the visual network, suggesting that stimulant-induced connectivity changes may contribute to improvements in visual attentional control, which is a common challenge for children with ADHD.
Why This Matters This study is one of the first to examine how stimulant use in real-world conditions affects brain networks in children with ADHD over time. The findings suggest that stimulants may help normalize certain connectivity patterns associated with ADHD, particularly in networks related to attention and control. These insights could help clinicians better understand the potential long-term effects of stimulant treatment and guide personalized approaches to ADHD management.
Conclusion Stimulant medications appear to alter striatal-cortical connectivity in children with ADHD, with some changes linked to symptom improvement. This research highlights the potential for stimulant medications to impact brain networks in ways that support attention and control, highlighting the importance of understanding how real-world medication use influences ADHD treatment outcomes.
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