History
The initial impetus for developing a classification of mental disorders in the United States was the need to collect statistical information. The first official attempt was the 1840 census which used a single category, "idiocy/insanity". In 1917, a Committee on Statistics from what is now known as the American Psychiatric Association (APA), together with the National Commission on Mental Hygiene, developed a new guide for mental hospitals called the "Statistical Manual for the Use of Institutions for the Insane", which included 22 diagnoses. This was subsequently revised several times by APA over the years. APA, along with the New York Academy of Medicine, also provided the psychiatric nomenclature subsection of the US medical guide, the Standard Classified Nomenclature of Disease, referred to as the "Standard".
Read more about this topic: Diagnostic And Statistical Manual Of Mental Disorders
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