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Table 3 Study 2 ecological validity

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

  Chronological age Mental agea FSIQb Adaptive behavior composite
Dimensional change card sort .23 .40** .53** .27
Flanker −.02 .59*** .77*** .59**
Picture vocabulary .32* .22 .38 .26
Oral reading .04 .61*** .71*** .73***
Picture sequence memory .03 .14 .44* .44*
Pattern comparison .19 .24 .50** .10
List sorting .28 .54** .61** .50*
NIH-TCB cognitive composite .75*** .61**
  1. Data shown are Pearson’s correlations. Note: NIH-TCB age-adjusted z deviation scores were used to correlate with age-adjusted standardized measures (IQ, adaptive behavior), whereas computed or theta scores (unadjusted) were used for correlations with mental and chronological age
  2. *p < .05; **p < .01; ***p < .001
  3. aIn study 2, mental age was either the actual mental age generated from individual IQ tests when test results were available or it was estimated by the examiner
  4. bIn study 2, IQ scores (Leiter-R or Stanford-Binet 5) were available from prior recent records in a subset of the sample (n = 25)