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Utilizing data from the WHO World Mental Health (WMH) Surveys, it is estimated that, in China (Shenzhen), the prevalence of childhood ADHD is 0.7% and the prevalence of adult ADHD is 1.8%. [13] This study also determined that for adults in China (Shenzhen) with existing ADHD, 62.8% had a history of childhood ADHD. [13]
A meta-analysis of the global prevalence of ADHD in adults, published in 2021, estimated a collective prevalence of persistent adult ADHD of 2.58% globally in 2020. [4] Persistent adult ADHD is defined as meeting diagnostic criteria for ADHD in adulthood with the additional requirement of a confirmed childhood diagnosis. [4]
This study contributed to the understanding of the neurobiological basis of ADHD, particularly highlighting the substantial phenotypic and neurobiological heterogeneity within ADHD. [15] It suggested that smaller-sized studies may overestimate case-control differences by not capturing the disorder's wide phenotypic and neurobiological variation.
Large, high quality research has found small differences in the brain between ADHD and non-ADHD patients. [1] [15] Jonathan Leo and David Cohen, critics who reject the characterization of ADHD as a disorder, contended in 2003 and 2004 that the controls for stimulant medication usage were inadequate in some lobar volumetric studies, which makes it impossible to determine whether ADHD itself or ...
ADDitude was founded by Ellen Kingsley (an Emmy-winning television journalist) in 1998 to serve the parents of America's 2-3 million schoolchildren [7] with ADD and ADHD, as well as adults, with the disorder. Kingsley founded ADDitude as a web site a few years after her oldest son, Teddy, was diagnosed with severe ADHD. [8]
In contrast, a 2014 peer-reviewed medical literature review indicated that ADHD is underdiagnosed in adults. [328] Studies from multiple countries have reported that children born closer to the start of the school year are more frequently diagnosed with and medicated for ADHD than their older classmates. [341]