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The DSM-IV criteria for diagnosis of ADHD is 3–4 times more likely to diagnose ADHD than is the ICD-10 criteria. [212] ADHD is alternately classified as neurodevelopmental disorder [213] or a disruptive behaviour disorder along with ODD, CD, and antisocial personality disorder. [214] A diagnosis does not imply a neurological disorder. [185]
In the UK, diagnosis is based on quite a narrow set of symptoms, and about 0.5–1% of children are thought to have attention or hyperactivity problems. In comparison, professionals in the U.S. used a much broader definition of the term ADHD until recently. [32] This meant up to 10% of children in the U.S. were described as having ADHD.
As the children grew older, the brain tissue thickened and their ADHD symptoms improved. Environmental factors, such as the mother smoking or drinking during pregnancy is connected to children with ADHD. Children exposed to lead at a young age will also have an increased chance of developing ADHD.
With 15.5 million U.S. adults currently diagnosed with ADHD, there is a growing focus on warning signs of the disorder. Mental health experts share the most common signs and symptoms.
The scientific study of the causes of developmental disorders involves many theories. Some of the major differences between these theories involves whether environment disrupts normal development, if abnormalities are pre-determined, or if they are products of human evolutionary history which become disorders in modern environments (see evolutionary psychiatry). [5]
The International Classification of Diseases (ICD) is an international standard diagnostic classification for a wide variety of health conditions. The ICD-10 states that mental disorder is "not an exact term", although is generally used "...to imply the existence of a clinically recognisable set of symptoms or behaviours associated in most cases with distress and with interference with ...
Diagnoses must be made by qualified mental health professionals. DSM-5 classifications of externalizing disorders are listed herein, however, ICD-10 can also be used to classify externalizing disorders. More specific criteria and examples of symptoms for various externalizing disorders can be found in the DSM-5. [citation needed]
Those with CDS symptoms typically show a later onset of their symptoms than do those with ADHD, perhaps by as much as a year or two later on average. Both groups had similar levels of learning problems and inattention, but CDS children had less externalizing symptoms and higher levels of unhappiness, anxiety/depression, withdrawn behavior, and ...