|
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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