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Table 2 Study 2 feasibility, test-retest reliability, and examination of practice effects

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

  Feasibility (% of n = 50 valid) Number (test-retest) Visit 1, mean (SD) Visit 2, mean (SD) t p Cohen’s d ICC
DCCS 84 17 3.32 (2.35) 3.89 (2.27) −1.51 .15 .13 .88
Flanker 82 17 4.44 (1.98) 4.33 (2.33) 0.23 .82 .23 .75
List sorting 66 14 9.36 (4.31) 8.00 (4.47) −1.56 .14 .31 .84
Oral reading 90 17 −3.94 (3.18) −3.88 (3.31) 0.71 .49 .03 .99
Pattern comparison 90 16 29.53 (13.47) 35.35 (12.86) 2.08 .01 .44 .90
Picture sequence memory 78 17 −1.39 (0.72) −1.12 (1.05) 1.45 .18 .46 .76
Picture vocabulary 92 17 −2.50 (2.13) −3.05 (1.94) −1.27 .22 .27 .77
  1. Test-retest reliability measured by intraclass correlation (ICC). Practice effects measured by paired samples t tests. Effect size of difference measured by Cohen’s d