|
IQ Classifications in Educational
Use
Wechsler, David.
Wechsler Adult Intelligence
Scale-Third edition
Psychological Corporation,
1997
|
|
Classification
|
IQ Score |
Percent Included
|
| |
|
Theoretical Normal Curve |
Actual Sample |
|
Very Superior |
130 and above |
2.2 |
2.1 |
|
Superior |
120-129 |
6.7 |
8.3 |
|
High Average* |
110-119 |
16.1 |
16.1 |
|
Average |
90-109 |
50.0 |
50.3 |
|
Low Average* |
80-89 |
16.1 |
14.8 |
|
Borderline |
70-79 |
6.7 |
6.5 |
|
Extremely Low* ** |
69 and below |
2.2 |
1.9 |
|
*The terms High Average,
Low Average and Extremely
Low correspond to the terms
Bright Normal, Dull
Normal and Mental Defective,
respectively, used in the 1955
WAIS manual.
**The term Extremely Low
is used in place of the terms
Mentally Retarded, used
in the WAIS-R, and Intellectually
Deficient, used in the WISC-III
to avoid the implication that
a very low IQ score is sufficient
evidence by itself for the classification
of "mental retardation" or "intellectually
deficient."
|
|
IQ Classifications in Psychiatric
Use
Diagnostic
and Statistical Manual of Mental
Disorders, Fourth Edition (DSM-IV)
American Psychiatric
Association, 1994
|
|
V62.89 |
Borderline Intellectual Functioning |
IQ 71-84 |
|
317 |
Mild Mental Retardation |
IQ 50-55 to approximately 70 |
|
318.0 |
Moderate Retardation
|
IQ 35-40 to 50-55 |
|
318.1 |
Severe Mental Retardation |
IQ 20-25 to 35-40 |
|
318.2 |
Profound Mental Retardation |
IQ below 20 or 25 |
|
The terms Educable Mentally
Retarded and Trainable
Mentally Retarded used in
special education are roughly
equivalent to DSM classifications
for mild and moderate mental
retardation, respectively.
The DSM diagnostic criteria
further require an assessment
and determination of impairment
in adaptive functioning in order
to make a diagnosis of mental
retardation.
|
|
IQ Classifications No Longer
in Use
Terman, Lewis M. The
Measurement of Intelligence.
Houghton Mifflin Company,
1916
An explanation of and complete
guide for the use of the
Stanford Revision
and extension of the Binet-Simon
Intelligence Scale
|
|
140 and over |
Genius or near genius |
|
120-140 |
Very superior intelligence |
|
110-120 |
Superior intelligence |
|
90-110 |
Normal or average intelligence |
|
80-90 |
Dullness |
|
70-80 |
Borderline deficiency |
|
Below 70 |
Definite feeble-mindedness |
|
Mental deficiency used to be
divided into the following sub-classifications,
but these labels began to be
abused by the public and are
now largely obsolete: Borderline
Deficiency (IQ 70-80),
Moron (IQ 50-69),
Imbecile (IQ 20-49) and
Idiot (below 20).
Mental deficiency is now
generally called mental retardation.
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