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Changes in the item content from the WISC-III to the WISC-IV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Number of Items on

 

Percent of Item increase - WISC-III to

 

Number of WISC-III Items Retained on

 

Percent of WISC-III Items Retained on

 

Number of New Items Written or Reworded

 

Percent of New Items Written or reworded

Subtest

WISC-III

 

WISC-IV

 

WISC-IV

 

WISC-IV

 

WISC-IV

 

for WISC-IV

 

for WISC-IV

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Verbal/Verbal Comprehension

 

 

 

 

 

 

 

 

 

 

 

 

 

Information

30

 

33

 

10.0%

 

22

 

73.3%

 

11

 

33.3%

Similarities

19

 

23

 

21.1%

 

12

 

63.2%

 

11

 

47.8%

Vocabulary

30

 

36

 

20.0%

 

27

 

90.0%

 

9

 

25.0%

Comprehension

18

 

21

 

16.7%

 

10

 

55.6%

 

11

 

52.4%

Word Reasoning

 

 

24

 

 

 

 

 

 

 

24

 

100.0%

Performance/Perceptual Reasoning

 

 

 

 

 

 

 

 

 

 

 

 

 

Picture Completion

30

 

38

 

26.7%

 

27

 

90.0%

 

12

 

31.6%

Picture Arrangement

14

 

Dropped

Block Design

12

 

14

 

16.7%

 

10

 

83.3%

 

4

 

28.6%

Object Assembly

 

 

Dropped

Mazes

10

 

Dropped

Picture Concepts

 

 

28

 

 

 

 

 

 

 

28

 

100.0%

Matrix Reasoning

 

 

35

 

 

 

 

 

 

 

35

 

100.0%

Processing Speed

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbols Search

45**/45***

 

45**/60***

 

33.3%

 

45

 

100.0%

 

15

 

25.0%

Coding

59** / 119***

 

59** / 119***

 

0.0%

 

59** / 119***

 

100.0%

 

0

 

0.0%

Cancellation

 

 

640

 

 

 

 

 

 

 

640

 

100.0%

Freedom from Distractibility/Working Memory

 

 

 

 

 

 

 

 

 

 

 

 

 

Digit Span*

30

 

36

 

20.0%

 

31

 

103.3%

 

5

 

13.9%

Arithmetic

24

 

34

 

41.7%

 

12

 

50.0%

 

22

 

64.7%

Letter-Number Sequence

 

 

10

 

 

 

 

 

 

 

10

 

100.0%

Total

 

 

 

 

 

 

 

 

 

 

 

 

 

Verbal/Verbal Comprehension

97

 

137

 

41.2%

 

71

 

73.2%

 

66

 

48.2%

Performance/Perceptual Reasoning

66

 

115

 

74.2%

 

37

 

56.1%

 

79

 

68.7%

Processing Speed

104**/164***

 

744**/819***

 

615.4%

 

104**/164***

 

 

 

655

 

88.0%

Freedom from Distractibility/Working Memory

54

 

80

 

48.1%

 

43

 

 

 

37

 

46.3%

Full Scale

321**/381***

 

1076**/1151***

 

235.2%

 

255**/315***

 

79.4%

 

837

 

77.8%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: Subtests in italic are new to the WISC-IV. * Digit Span retained the same number series with the exception of 3 series having only 1 number changed ** refers to Form A, *** refers to Form B

The number and percent of items retained from the WISC-III to the WISC-IV includes only those items that were taken directly from the WISC-III. Several items (e.g., Arithmetic) have had substantial word changes and so were not counted as having been retained. The new items written for the WISC-IV are expressed as a percentage of the number of items on the WISC-IV.