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Table 6 Proportion of participants (%) by mental age group able to complete tests yielding scores judged by examiners and by data review to be valid (combined studies 2 and 3)

From: The NIH Toolbox Cognitive Battery for intellectual disabilities: three preliminary studies and future directions

Mental age group

Number

DCCS

Flanker

Picture vocabulary

Oral reading

Picture sequence memory

Picture comparison

List sorting

3

26

65.4

76.9

88.5

88.5

61.5

69.2

34.6

4

20

85.0

80.0

90.0

90.0

85.0

90.0

50.0

5–6

25

84.0

88.0

92.0

92.0

96.0

84.0

76.0

7–8

12

100.0

100.0

100.0

100.0

100.0

100.0

100.0

9+

5

100.0

100.0

100.0

100.0

100.0

100.0

100.0

  1. Note that in study 2, mental age was estimated based on chart review and examiner estimation. In study 3, mental age was measured by Stanford-Binet 5 IQ testing