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HANS ZELLWEGER, M.D.

Arch Intern Med. 1963;111(2):165-177.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The incidence of mental retardation is approximately 3% of the population. Hence, the problem of mental retardation is of considerable magnitude. Ninety out of one hundred defectives fall within the category of the morons or feebleminded with an intelligence quotient (IQ) between 75 and 50, eight to nine are imbecile (IQ between 50 to 25), and one to two are idiots (IQ below 25). A number of all the cases of mental retardation are hereditary in origin. Environmental factors are likewise important in causing mental retardation. Some of them are listed in Table 1. In some instances, both hereditary and environmental factors act conjointly. Interaction between nature and nurture may play a role in the pathogenesis of some cases of mental retardation. Mental retardation occurring after a post- or parainfectious or postvaccinal encephalopathy is classified usually as environmental in origin, though a hereditary component may be at least partly responsible . . . [Full Text PDF of this Article]

Author Affiliations
IOWA CITY

Footnotes
Received for publication Oct. 12, 1962; accepted Oct. 16.

Supported by Grant B 2543 from the U.S. Public Health Service, National Institutes of Health.

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