2018
DOI: 10.1007/s00787-018-1180-6
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Age level vs grade level for the diagnosis of ADHD and neurodevelopmental disorders

Abstract: A number of worldwide studies have demonstrated that children born later in the school year are more likely to receive an ADHD diagnosis than their same school-year peers. There is, however, variation in findings between countries. We aimed to confirm whether relative age is associated with ADHD diagnosis, with or without comorbidities, and to investigate whether relative age is associated with ADHD type and severity, and if this age relationship is in common with other neurodevelopmental disorder. We used the… Show more

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Cited by 25 publications
(20 citation statements)
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“…It has been stated that any characteristics that set children apart from the group increases the likelihood of them being bullied. 2 The relative age effects found in mental health 10 and ADHD 12,13 have also been explained by differences in maturity 13,28,29 and cognitive and social skills 10 related to age.…”
Section: Discussionmentioning
confidence: 99%
“…It has been stated that any characteristics that set children apart from the group increases the likelihood of them being bullied. 2 The relative age effects found in mental health 10 and ADHD 12,13 have also been explained by differences in maturity 13,28,29 and cognitive and social skills 10 related to age.…”
Section: Discussionmentioning
confidence: 99%
“…We used the methodology previously described and reporting details concerning: the local health setting [19], the characteristics of the ADHD Registry activated in Lombardy in June 2011 [20–22], the systematic work made by the18 ADHD centers belonging to the Lombardy ADHD Group [23], the rigorous diagnostic assessment (according to national and international guidelines, and DSM - IV - TR ) approved by all involved clinicians [24, 25], the evaluation of follow-up and the effect size of provided care [26].…”
Section: Methodsmentioning
confidence: 99%
“…5,6,34,37,40,41,44,47 Of the 12 included studies that focused on relative age, 11 studies showed that the youngest children in class were more likely to be diagnosed with ADHD than the oldest children. 22, [68][69][70][71][72][73][74][75][76][77] One study did not confirm this finding. 78 It was conducted in a low-prevalence setting in which only specialists diagnosed ADHD, suggesting that variation (and a potential reservoir) is much smaller where stricter adherence to diagnostic criteria may occur.…”
Section: Large Reservoir Of Potentially Diagnosable Adhdmentioning
confidence: 96%