|
Differences Required for Significance When Each
WISC–IV®
Subtest Scaled Score Is Compared to the
Mean Subtest Scaled Score for Any Individual Child
Comparison to Full Scale
(FSIQ) Mean
|
|
Mean of 10 subtests
for FS |
Mean of 15 subtests
for FS |
|
Subtest |
0.05 |
0.01 |
0.05 |
0.01 |
|
Similarities |
2.93 |
3.45 |
3.21 |
3.71 |
|
Vocabulary |
2.62 |
3.08 |
2.87 |
3.32 |
|
Comprehension |
3.37 |
3.96 |
3.68 |
4.26 |
|
Information |
|
|
3.29 |
3.80 |
|
Word Reasoning |
|
|
3.76 |
4.35 |
|
Block Design |
2.93 |
3.45 |
3.21 |
3.71 |
|
Picture Concepts |
3.33 |
3.91 |
3.63 |
4.20 |
|
Matrix Reasoning |
2.60 |
3.05 |
2.85 |
3.29 |
|
Picture Completion |
|
|
3.39 |
3.93 |
|
Digit Span |
2.79 |
3.28 |
3.25 |
3.76 |
|
Letter-Number Sequencing |
2.55 |
2.99 |
2.79 |
3.23 |
|
Arithmetic |
|
|
3.00 |
3.47 |
|
Coding |
3.11 |
3.96 |
3.39 |
3.93 |
|
Symbol Search |
3.50 |
4.11 |
3.82 |
4.42 |
|
Cancellation |
|
|
3.87 |
4.48 |
Comparison to Verbal Comprehension (VCI) Mean
|
|
Mean of 3 subtests
for VCI |
Mean of 4 subtests
for VCI |
Mean of 5 subtests
for VCI |
|
Subtest |
0.05 |
0.01 |
0.05 |
0.01 |
0.05 |
0.01 |
|
Similarities |
2.23 |
2.73 |
2.46 |
2.98 |
2.65 |
3.18 |
|
Vocabulary |
2.11 |
2.58 |
2.28 |
2.76 |
2.43 |
2.92 |
|
Comprehension |
2.41 |
2.95 |
2.73 |
3.30 |
2.96 |
3.55 |
|
Information |
|
|
2.51 |
3.03 |
2.7 |
3.24 |
|
Word Reasoning |
|
|
|
|
3.01 |
3.62 |
Comparison to Perceptual Reasoning (PRI) Mean
|
|
|
|
|
|
|
|
|
|
|
|
Mean of 3 subtests
for PRI |
Mean of 4 subtests
for PRI |
|
|
|
Subtest |
0.05 |
0.01 |
0.05 |
0.01 |
|
|
|
Block Design |
2.22 |
2.72 |
2.47 |
2.98 |
|
|
|
Picture Concepts |
2.38 |
2.92 |
2.7 |
3.26 |
|
|
|
Matrix Reasoning |
2.09 |
2.56 |
2.27 |
2.74 |
|
|
|
Picture Completion |
|
|
2.57 |
3.1 |
|
|
|
|
|
|
|
|
|
|
Comparison to
Working Memory (WMI) Mean
|
|
|
|
|
Mean of 2 subtests
for WMI |
Mean of 3 subtests
for WMI |
|
|
|
Subtest |
0.05 |
0.01 |
0.05 |
0.01 |
|
|
|
Digit Span |
1.62 |
2.03 |
2.05 |
2.51 |
|
|
|
Letter-Number Sequencing |
1.62 |
2.03 |
1.95 |
2.39 |
|
|
|
Arithmetic |
|
|
2.03 |
2.49 |
|
|
|
|
|
|
|
|
|
|
Comparison to
Processing Speed (PSI) Mean
|
|
|
|
|
Mean of 2 subtests
for PSI |
Mean of 3 subtests
for PSI |
|
|
|
Subtest |
0.05 |
0.01 |
0.05 |
0.01 |
|
|
|
Coding |
2.03 |
2.55 |
2.46 |
3.01 |
|
|
|
Symbol Search |
2.03 |
2.55 |
2.61 |
3.2 |
|
|
|
Cancellation |
|
|
2.63 |
3.23 |
|
| |
|
|
|
|
|
|
|
|
The critical values were
found using a formula from Davis (1959) that computes the deviations from
average that are significant at the desired significance level. For a
description of this technique, see Sattler (2002, Table A-4).
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