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The test publishers do not have a uniform practice of labeling IQ score ranges, nor do they have a consistent practice of dividing up IQ score ranges into categories of the same size or with the same boundary scores. [25] Thus psychologists should specify which test was given when reporting a test-taker's IQ category if not reporting the raw IQ ...
Terman's test was the first widely used mental test to report scores in "intelligence quotient" form ("mental age" divided by chronological age, multiplied by 100). Current tests are scored in "deviation IQ" form, with a performance level by a test-taker two standard deviations below the median score for the test-takers age group defined as IQ 70.
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
Borderline intellectual functioning, previously called borderline mental retardation (in the ICD-8), [1] is a categorization of intelligence wherein a person has below average cognitive ability (generally an IQ of 70–85), [2] but the deficit is not as severe as intellectual disability (below 70). It is sometimes called below average IQ (BAIQ).
The designation of mental retardation (or developmental disability) typically requires a measured IQ below 70 or 75. [citation needed] The Supreme Court of the United States has utilized IQ test results during the sentencing phase of some criminal proceedings. The Supreme Court case of Atkins v.
This category is for individuals with an intelligence quotient score below 70 on a standardized IQ test. [1] Any article included here should have a verifiable proof for the intellectual impairment in its references (i.e., tested IQ test score or formal diagnosis as having any form of intellectual disability ).
In the obsolete medical classification (ICD-9, 1977), these people were said to have "moderate mental retardation" or "moderate mental subnormality" with IQ of 35–49, as they are usually capable of some degree of communication, guarding themselves against danger and performing simple mechanical tasks under supervision. [5] [6]
The mental retardation paradox – the IQ level commonly associated with mental retardation is 75. If the Flynn effect is extrapolated back to 1900 the mean IQ would be somewhere between 50 and 70 – that is the average person in 1900 would have been intellectually disabled by modern IQ norms.
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