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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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