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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