Attention Deficit Research Articles

TRANSTORNO DE DÉFICIT DE ATENÇÃO E HIPERATIVIDADE (TDAH) EM CRIANÇAS E ADOLESCENTES: REVISÃO DA ABORDAGEM TERAPÊUTICA

Introduction: The management of patients with ADHD remains complex, especially due to the high prevalence of associated comorbidities, which may require adjusted therapeutic approaches. Objective: To evaluate, through a literature review, the main medications used in the treatment of ADHD in children and adolescents, and compare the benefits of these medications on the main symptoms (hyperactivity/impulsivity/inattention). Materials and Methods: This is a literature review conducted according to the items of the report for the systematic review and meta-analyses guidelines (PRISMA). The search strategy was conducted through PubMed, Virtual Health Library, Scopus, and Embase for all relevant articles that directly addressed attention deficit hyperactivity disorder. The identified studies were selected based on titles and abstracts, excluding irrelevant or restricted access articles. Results: After an extensive search of articles in the databases mentioned here, three articles from 2016, three from 2017, four from 2018, one from 2019, five from 2020, seven from 2021, four from 2022, eight from 2023, and five from 2024 were selected for this literature review, totaling 40 articles included from the years 2016 to 2024. Conclusion: Through the development of this literature review, it was observed that the treatment of ADHD in children and adolescents requires a personalized and multimodal approach, combining pharmacological therapy with behavioral interventions, taking into account the associated comorbidities and the side effect profile.

Effects of active breaks on educational achievement in children with and without ADHD: study protocol and rationale of the Break4Brain project

The Break4Brain project aims to elucidate the effects of both acute and chronic physical activity (PA) on educational achievement in children with and without Attention Deficit Hyperactivity Disorder (ADHD). This study will be conducted in two phases: a cross-over design followed by a hybrid type 1 implementation-effectiveness trial, which includes both a cluster randomized controlled trial (RCT) and a qualitative study. In phase I, 60 children aged 10–12, with 30 each from ADHD and non-ADHD groups, will participate in a laboratory-based study over 4 days within 1 month. They will participate in three counterbalanced experimental conditions: (i) PA with cognitive engagement, (ii) PA without cognitive engagement, and (iii) a cognitively engaging control. This phase will assess acute changes in brain function, academic performance, working memory, inhibitory control, and sustained attention. Phase II will involve 600 children aged 10–12, randomly assigned to either a video-based PA program or a control group (300 children per group) in an 8-week cluster RCT. This phase will also incorporate a qualitative approach to explore the implementation context through pre- and post-intervention semi-structured interviews with teachers and school staff, and questionnaires for students. The outcomes of interest in this phase will include working memory, cognitive flexibility, selective attention, and academic performance. For the cross-over study, we hypothesize that PA conditions will enhance the studied outcomes compared to the control condition. In the RCT, we anticipate that the 8-week active breaks program will result in significant improvements in the selected outcomes compared to the control group. This study is expected to make pioneering contributions by including novel variables and focusing on the ADHD population. Furthermore, if the cluster RCT proves effective, it could offer a practical and cost-effective resource for integrating active breaks into daily school routines.

Influence of parental education on care patterns of children with attention deficit hyperactivity disorders in Indonesia

Severe disparities in the care of children with Attention Deficit-yperactivity Disorder (ADHD) against the background of financial stability and parental demographic areas are major public health challenges in Indonesia. This study was designed to investigate how parental education influences care pattern of children with ADHD. We carried out interventions in the form of counseling and assistance regarding the care of ADHD children in the family. Of the 70 children included in the study, 33 (47.1%) did not attend mental health appointments and 51 (72.9%) did not receive any treatment at 3 to 6 month follow-up. Logistic regression showed that increasing age and medication problems were associated with fewer follow-ups on mental health appointments (P < 0.05) and less treatment utilization (P < 0.05). The results of this study implicated that the higher the educational background the parent has, the more adequate treatment the ADHD children receive. This is the fact that care patterns are likely dependent on parental education’s status. Further study on which factor between financial status and socio-demographic that has higher impact on ADHD children’s parents and coping style should be conducted.

Role of adenosine in the pathophysiology and treatment of attention deficit hyperactivity disorder.

Attention deficit hyperactivity disorder (ADHD) is a complex neurodevelopmental condition characterized by persistent inattention, hyperactivity, and impulsivity. Although its precise etiology remains unclear, current evidence suggests that dysregulation within the neurotransmitter system plays a key role in the pathogenesis of ADHD. Adenosine, an endogenous nucleoside widely distributed throughout the body, modulates various physiological processes, including neurotransmitter release, sleep regulation, and cognitive functions through its receptors. This review critically examines the role of the adenosine system in ADHD, focusing on the links between adenosine receptor function and ADHD-related symptoms. Additionally, it explores how adenosine interacts with dopamine and other neurotransmitter pathways, shedding light on its involvement in ADHD pathophysiology. This review aims to provide insights into the potential therapeutic implications of targeting the adenosine system for ADHD management.

Gambaran Penerapan Pola Asuh Orang Tua dengan Anak Attention Deficit/Hyperactivity Disorder

This research study delves into the parenting styles employed by parents of children with Attention Deficit Hyperactivity Disorder (ADHD). ADHD is a neurodevelopmental disorder characterized by inattention, hyperactivity, and impulsivity, potentially impacting a child's social, academic, and professional functioning. The research method used is qualitative. The study involved three pairs of parents cohabiting with their children aged 6-11 years old who have been diagnosed with ADHD by a specialist. The Parenting Styles and Dimensions Questionnaire (PSDQ) was employed to categorize the parenting styles of each couple. Screening results were further analyzed qualitatively, and semi-structured interviews were conducted to gather qualitative data. The findings revealed that parents do not adhere to a single parenting style, exhibiting varied responses and employing different styles depending on the situation and specific conditions. Mothers tend to be more involved in their child's daily activities, actively implementing strategies to manage ADHD symptoms, while fathers are more involved in disciplining their children through punishments aimed at promoting discipline.

Pemanfaatan Literasi Digital Dalam Meningkatkan Kreativitas Motorik Anak Berkebutuhan Khusus (ABK)

ABK's motor creativity is said to be good if they are in the right environment, surrounded by people who understand their special needs, both in terms of assisting, guiding and supporting no matter how small they do. Collaboration of digital learning and conventional creativity is one of the strategies developed by HSBE academically/non-academicly. The reading literacy ability of ABK is quite good in understanding writing, pictures, colors but due to verbal limitations it seems difficult to speak and not yet fluent in reading. The need for digital literacy for children with special needs in the form of visual art comics in the form of visualization of picture story books and visualization of digital fairy tales is quite influential in improving the motor skills of children with special needs. The computer science program was attended by ABK grades 2 and 3 because they were already able to operate basic computer systems. This study uses a qualitative descriptive method involving teachers, parents and children with special needs as a sample. The results of this study concluded that 2 children with special needs: 1ADHD – GAP (Attention Deficit Hyperactivity Disorder) and 1ASD – RRF (Autism Spectrum Disorder) have very low ratings in utilizing digital media compared to 3 other children with special needs so that they require extra assistance and learning media

Effect of cognitive remediation therapy in anorexia nervosa: a systematic review and meta-analysis.

Anorexia nervosa (AN) can significantly affect cognitive well-being. Cognitive remediation therapy (CRT) is regarded as one of the effective treatments for cognitive impairment in some mental illnesses such as schizophrenia, bipolar disorder, and attention deficit. For this reason, this systematic review and meta-analysis aim to assess the effectiveness of CRT in patients with AN. We conducted a search of Medline, ClinicalTrials.gov, and the Cochrane Database of Systematic Reviews from the inception of each database through April 8, 2023. Randomized clinical trials evaluating the effectiveness of CRT in comparison to placebo or other psychological treatments in patients with AN were included. The quality of the studies was assessed using the revised Cochrane risk-of-bias tool. For meta-analysis, effect sizes were measured using mean difference (MD) utilizing the random-effects model and inverse variance (IV) technique. To evaluate the certainty of the evidence, we applied the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) criteria. The study was registered in PROSPERO, ID: CRD42023411784. In the systematic review, six studies were included, of which four underwent meta-analysis. Among these, three trials encompassing 413 participants showed that CRT was associated with improved cognitive flexibility compared to control at the end of treatment (MD = -0.21, 95% CI [-0.44, 0.02], P=0.81, I2 = 0%). In two trials with 143 patients, those who received CRT showed similar effects on the severity of AN symptoms compared to the control group in the self-reporting questionnaires: EDE-Q (MD = -0.25, 95% CI [-0.76, 0.27], P=0.77, I2 = 0%) and EDEQOL (MD = -0.19, 95% CI [-0.41, 0.03], P=0.84, I2 = 0%). CRT did not show a statistically significant difference compared to the control group in improving abstract thinking skills and quality of life in individuals with AN. That indicates that CRT's efficacy remains inconclusive. Further research with larger, more diverse samples is needed to determine its long-term effects and potential benefits. PROSPERO, identifier CRD42023411784.

Teaching a foreign language through ICT to students with dyslexia and attention deficit hyperactivity disorder (ADHD) and the role of ICTs

Students with learning disabilities are a heterogeneous group and exhibit particularities in the areas of perception, language, memory, attention and concentration, metacognition, self-regulation, motivation, behavior, social skills and emotional development. It is therefore important to identify these difficulties as early as possible, so that students can be helped in time by adapting teaching to their own needs. New technologies, already promising in a variety of fields, seem to be able to be used for the necessary differentiation of teaching, materials and assessment of students with learning difficulties such as dyslexia and ADHD.

Using Bifactor Twin Modeling to Assess the Genetic and Environmental Dimensionality of Adult ADHD Symptoms.

Attention Deficit Hyperactivity Disorder (ADHD) is a common and heritable neurodevelopmental condition that has been the subject of a wealth of genetics research. Because ADHD has an early age of onset, most of this work has focused on children, meaning that less is known about the genetics of ADHD in adults. Additionally, while much research has assessed the heritability of ADHD as a general dimension, less has assessed the heritability of individual subtypes (inattention, hyperactivity) or symptoms of ADHD. It therefore remains unclear whether the genetic factors underlying ADHD symptoms conform to a unidimensional or multidimensional structure. The aim of this study was to assess the genetic and environmental dimensionality of adult ADHD symptoms. We analyzed data from 10,454 twins of the Twins Early Development Study, who provided self-reports of ADHD symptoms using the Conners scale at age 21 years. The data conformed well to a psychometric bifactor model, providing support for a general dimension of ADHD in addition to secondary dimensions for inattention and hyperactivity. However, a bifactor independent pathway twin model provided support for a general dimension only at the level of non-shared environmental effects and not additive genetic or shared environmental effects. This suggests that symptoms of ADHD cluster together under a general dimension of non-shared environmental effects, although the two subtypes of ADHD (inattention and hyperactivity) are meaningfully genetically distinct. We found the overall heritability of ADHD to be 40%, comparable with previous estimates for adult ADHD symptoms. Our results provide useful insights into the genetic and environmental architecture of specific ADHD symptoms.

Complications of excess weight seen in two tier 3 paediatric weight management services: an observational study.

Children and young people living with severe obesity experience a range of complications of excess weight (CEW); however the prevalence of complications is not well defined. We have evaluated baseline characteristics and CEW of patients from two UK tier 3 paediatric weight management services. All new patients aged 2-17 years seen from March 2022 to February 2023 were included. Baseline demographic data was collected, and patients screened for CEW. PedsQL-4.0 questionnaires were used to assess health-related quality of life (HRQL). 185 patients were included, median age 14.3 years (range 3.3-18.0), 50.8% were girls. Of the patients, 73.8% were white British, with a significant excess of patients living in the most deprived decile (41.4%). Median body mass index SD score was +3.55 (IQR 3.11-3.90) and median body fat was 49.3% (IQR 42.3%-55.1%). Autistic spectrum disorder, attention deficit hyperactivity disorder and learning difficulties were vastly over-represented.Dyslipidaemia was the most common (51.6%) complication, followed by hypertension (28.9%), metabolic dysfunction-associated steatotic liver disease (17.8%), obstructive sleep apnoea (9.0%) and idiopathic intracranial hypertension (4.3%). Mean glycated haemoglobin was 35.0 mmol/mol (IQR 33-38). 8.1% had type 2 diabetes mellitus. Many of these complications were detected through screening in CEW clinics.Both child-reported (mean 51.9/100) and parented-reported (47.8/100) HRQL scores were low. Mental health problems were common: 26.2% with anxiety and 7.7% with depression. This study demonstrates the significant and profound mental and organ-specific pathology resulting from severe obesity in childhood, highlighting the clinical necessity for CEW clinics. A rigorous approach to identify complications at an early stage is essential to improve long-term health outcomes.

Relationship between co-occurring autism spectrum disorder and attention deficit hyperactivity disorder traits and internet addiction among college students in Japan

Relationship between co-occurring autism spectrum disorder and attention deficit hyperactivity disorder traits and internet addiction among college students in Japan

Risk of neurodevelopmental impairment in Swedish preterm children treated for necrotizing enterocolitis: retrospective cohort study.

As the survival of preterm infants has increased, the management of long-term complications, especially neurodevelopmental impairment, becomes increasingly important. The aim of this study was to investigate the risk of neurodevelopmental disorders in preterm babies receiving medical or surgical treatment for necrotizing enterocolitis, compared with other preterm babies and preterm babies who received abdominal surgery for other indications. In this nationwide Swedish cohort study, including all liveborn preterm babies born between 1998 and 2019, the risk of attention deficit (and hyperactivity) disorder, autism spectrum disorders, cerebral palsy and intellectual disability was assessed by multivariable Cox regression, expressed as hazard ratios and 95% confidence intervals (c.i.). Of the surgically (n = 384) and medically (n = 709) treated preterm infants with necrotizing enterocolitis, neurodevelopmental disorders were present in 32% (HR 2.24, 95% c.i. 1.86 to 2.69) and 22% respectively (HR 1.40, 95% c.i. 1.19 to 1.65), compared with 21% (HR 1.63, 95% c.i. 1.40 to 1.91) in the abdominal surgery group (n = 844) and 13% (reference) among other preterm infants (n = 78 972). The highest relative increases were for intellectual disability (HR 3.60, 95% c.i. 2.65 to 4.89) in the surgical necrotizing enterocolitis group and abdominal surgery group (HR 2.84, 95% c.i. 2.12 to 3.80) compared with the control preterm group, and for cerebral palsy (respectively HR 2.74, 95% c.i. 2.04 to 3.68 and HR 2.54, 95% c.i. 1.87 to 3.44). Medically treated necrotizing enterocolitis was associated with autism (HR 1.67, 95% c.i. 1.34 to 2.08), without significant increases for the other specific outcomes. Both surgically treated groups were also strongly associated with both attention deficit (and hyperactivity) disorder and autism. Surgically treated necrotizing enterocolitis, medically treated necrotizing enterocolitis and abdominal surgery for other indications in preterm infants were all associated with an increased risk of impaired neurodevelopmental outcomes, compared with other preterm infants.

Associations Between DCD Traits, Perceived Difficulties Related to ADHD, ASD, and Reading and Writing Support Needs Among Students in Higher Education: A Pilot Study

Background/Objectives: Since the Act for Eliminating Discrimination against Persons with Disabilities was enacted in 2016, the number of students with disabilities in higher education institutions has increased significantly, creating a greater need for support. Developmental Coordination Disorder (DCD) often coexists with other neurodevelopmental disorders such as Autism Spectrum Disorder (ASD), Attention Deficit Hyperactivity Disorder (ADHD), and reading and writing difficulties; yet, awareness of DCD remains low. This study aimed to investigate the prevalence of DCD traits among Japanese higher education students and their relationship with ADHD, ASD, and reading and writing support needs Methods: A pilot study was conducted with 77 university students (mean age: 19.17 ± 0.68) in the Kansai region, using the Adolescents and Adults Coordination Questionnaire (AAC-Q) to screen for DCD traits, along with a questionnaire assessing difficulties related to ADHD and ASD, and a survey on reading and writing support needs. Results: The study found that 12.9% of students scored more than 1 standard deviation above the mean on the AAC-Q. Students in the DCD trait group (n = 10) reported greater difficulties related to ADHD and ASD than those in the non-DCD group (n = 67). Correlation analysis revealed a moderate-to-strong association between AAC-Q scores and difficulties related to ADHD and ASD among students in the DCD trait group. Conclusions: This study suggests the need to raise awareness about DCD traits and to provide comprehensive support for students with ADHD and ASD in Japanese higher education institutions.

Myelination deficiency in rats with genetically determined dopamine metabolism disorder

BACKGROUND: Attention deficit hyperactivity disorder is one of the most common neuropsychiatric disorders affecting children. The exact causes of attention deficit hyperactivity disorder are still not fully understood. Myelination deficiency in nerve fibers could be one of the possible factors in the pathogenesis of attention deficit hyperactivity disorder. Dopamine transporter knockout (DAT-KO) rats provide a good translational model for attention deficit hyperactivity disorder because they mimic behavioral symptoms of the disease: hyperactivity, cognitive impairment and compulsive behavior. This paper aims to determine abnormalities in the myelination process in the spinal cord of DAT-KO rats. Our findings can lead to a better understanding of the etiology and pathogenesis of attention deficit hyperactivity disorder. AIM: To determine the mRNA expression levels of myelination-related genes in the spinal cord of dopamine transporter knockout (DAT-KO) rats during their natural development. MATERIALS AND METHODS: The study was performed on 72 rat pups (DAT-KO, DAT-HET, DAT-WT) from 12 litters. Rat pups were born from the pairs of intercrossed DAT-HET x DAT-HET adult rats. Pups were decapitated on 7th, 14th and 21st day of their postnatal development. After that, mRNA levels of the main myelination-related genes were measured in the cervical and lumbar segments of the spinal cord using real-time PCR. RESULTS: The mRNA levels of the mag, olig2 and plp1 genes were significantly different in the cervical and lumbar spinal cords of DAT-KO rats compared to DAT-WT animals. A significant increase in the level of mag gene mRNA in DAT-HET and DAT-KO animals was observed on 14th and 21st days of postnatal development. Also, in these animals, the olig2 mRNA levels were increased on the 21st day of postnatal development. The plp1 mRNA level was increased on the 14th day, and reduced on the 21st day of postnatal development in DAT-KO animals. CONCLUSIONS: Myelination deficiency in nerve fibers in the spinal cord of DAT-KO rats is one of the effects of gene knockout. It is also of the possible causes of behavioral changes — hyperactivity, cognitive impairment and compulsive behavior.

Parenting a child with attention deficit hyperactivity disorder: Jordanian's perspectives.

Raising your child with attention deficit hyperactivity disorder (ADHD) in Jordan is a challenge due to the prevailing behavioral concerns, low availability of specialized care, and generalized feelings of social stigma. This phenomenological study involved twelve Jordanian parents of children aged 4-14years, all diagnosed with ADHD according to DSM-IV-TR criteria. Participants were recruited through purposive sampling, and semi-structured interviews were conducted. Thematic analysis revealed three key themes: "The Journey through ADHD," in which parents recognized the abnormalities of their children, reported suffering during the diagnosis, and described a wide range of uncertainty regarding the diagnosis and treatments. The second theme was "Disease as part of life," where parents reported the impact on family dynamics and social life. The third theme was "Caregiving burden," reflecting physical and emotional exhaustion and financial burden. Jordanian parents caring for children with ADHD face several challenges, including physical, emotional, economic, and social challenges and limited access to specialized services. Identifying their unique needs and challenges is essential in supporting them, providing appropriate services and resources, and developing policies and guidelines for culturally competent quality services.

Metalinguistic and Reading Skills in a Sample of Colombian Children with Attention Deficit Hyperactivity Disorder

Objective: This study aimed to examine metalinguistic skills and reading processes in children diagnosed with ADHD, compared to a matched control group. Method: An explanatory experimental design was employed, involving a sample of 194 children from Manizales, comprising 97 children diagnosed with ADHD and 97 controls. The study utilized tasks from the Children’s Neuropsychological Assessment (CNA) protocol to assess metalinguistic and reading abilities. Results: Children with ADHD exhibited significantly lower performance across all metalinguistic and reading tasks compared to the control group, except for spelling and silent reading comprehension tasks. Conclusions: These findings corroborate previous research conducted in Manizales, underscoring the specific challenges in metalinguistic and reading domains among children with ADHD. Future research should explore the influence of working memory on phonological awareness and its implications for metalinguistic skills and reading development.

Exploring the Link between the Obesity and ADHD

Obesity is a chronic, multifactorial and recurrent disease. ADHD is a chronic neurodevelopmental disorder in early childhood. The core symptoms include attention deficit, hyperactivity/impulsivity and oppositional defiance. Research shows that there is a significant correlation between obesity and ADHD, and the probability of overweight and obese children suffering from ADHD is significantly higher than that of normal weight children. This paper discusses the association mechanism between ADHD and obesity from the perspectives of genetics, eating disorders, intestinal flora and poor physical exercise. At the same time, in view of the prevention and intervention of the comorbidity of ADHD and obesity, this paper also puts forward various means such as diet intervention, exercise prevention intervention and drug treatment. However, the relationship between obesity and ADHD is complex, and the comorbidity problem needs to be solved urgently. Establishing an effective early screening system, implementing targeted prevention and intervention measures, and strengthening public awareness and understanding of comorbidities are important ways to improve the quality of life of this group. Further research is needed in the future.

Fecal microbial marker panel for aiding diagnosis of autism spectrum disorders.

Accumulating evidence suggests that gut microbiota alterations influence brain function and could serve as diagnostic biomarkers and therapeutic targets. The potential of using fecal microbiota signatures to aid autism spectrum disorder (ASD) detection is still not fully explored. Here, we assessed the potential of different levels of microbial markers (taxonomy and genome) in distinguishing children with ASD from age and gender-matched typically developing peers (n = 598, ASD vs TD = 273 vs 325). A combined microbial taxa and metagenome-assembled genome (MAG) markers showed a better performance than either microbial taxa or microbial MAGs alone for detecting ASD. A machine-learning model comprising 5 bacterial taxa and 44 microbial MAG markers (2 viral MAGs and 42 bacterial MAGs) achieved an area under the receiving operator curve (AUROC) of 0.886 in the discovery cohort and 0.734 in an independent validation cohort. Furthermore, the identified biomarkers and predicted ASD risk score also significantly correlated with the core symptoms measured by the Social Responsiveness Scale-2 (SRS-2). The microbiome panel showed a superior classification performance in younger children (≤6 years old) with an AUROC of 0.845 than older children (>6 years). The model was broadly applicable to subjects across genders, with or without gastrointestinal tract symptoms (constipation and diarrhea) and with or without psychiatric comorbidities (attention deficit and hyperactivity disorder and anxiety). This study highlights the potential clinical validity of fecal microbiome to aid in ASD diagnosis and will facilitate studies to understand the association of disturbance of human gut microbiota and ASD symptom severity.

Prenatal Alcohol Exposure Disrupts Performance in a Differential Reinforcement of Low Rates Task Specifically in Adolescent Male Rats.

Prenatal alcohol exposure (PAE) can lead to a wide range of adverse effects in humans, including impaired self-control and increased impulsive behavior. Deficits in self-control can interfere with academic performance and have lasting impacts. In the present study, a rodent model of PAE was used to assess impulsivity through operant conditioning. Pregnant rats were assigned to one of three groups: ad-lib control (CON), pair-fed (PF), and alcohol-exposed (ALC). ALC rats were given a liquid diet containing 6% alcohol, PF rats were yoked to an ALC rat and given a CON liquid diet, and CON rats received ad libitum food. Operant conditioning was used to evaluate extinction in adolescents (Experiment 1) and differential reinforcement of low rates (DRL) in adolescents and adults (Experiment 2). PAE resulted in an increase in responses and resets during DRL testing, indicative of impaired self-control, an effect that was only observed in adolescent males. Females, regardless of age, did not show increased impulsivity following PAE. This indicates that children with PAE may exhibit attentional deficits similar to those with attention deficit hyperactivity disorder, with males at a higher risk.

Common Genetic Influence on the Relationship Between Gaming Addiction and Attention Deficit Hyperactivity Disorder in Young Adults: A Twin Study.

Although the relationship between gaming addiction (GA) and attention deficit hyperactivity disorder (ADHD) is well established, the causal mechanism of this relationship remains ambiguous. We aimed to investigate whether common genetic and/or environmental factors explain the GA-ADHD relationship. We recruited 1413 South Korean adult twins (837 monozygotic [MZ], 326 same-sex dizygotic [DZ], and 250 opposite-sex DZ twins; mean age = 23.1 ± 2.8 years) who completed an online survey on GA and related traits. Correlational analysis and bivariate model-fitting analysis were conducted. Phenotypic correlation between GA and ADHD in the present sample was 0.55 (95% CI [0.51, 0.59]). Bivariate model-fitting analysis revealed that genetic variances were 69% (95% CI [64%, 73%]) and 68% (95% CI [63%, 72%]) for ADHD and GA respectively. The remaining variances (ADHD: 31%; GA: 32%) were associated with nonshared environmental variances, including measurement error. Genetic and nonshared environmental correlations between ADHD and GA were 0.68 (95% CI [0.62, 0.74]) and 0.22 (95% CI [0.13, 0.30]) respectively, which indicates that shared genes can explain 82% of the phenotypic correlation between ADHD and GA. Our study demonstrated that the ADHD-GA association was largely due to shared genetic vulnerability.