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Table 7 Study 3 test-retest reliability and examination of practice effects

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

  Number Visit 1, mean (SD) Visit 2, mean (SD) t p Cohen’s d Test-retest reliability, (21–49 days) Test-retest reliability, general population, 3–15 years, (7–21 days)b
ICC ICC
Dimensional change card sort 27 3.52 (3.46) 4.29 (3.25) −1.31 .20 .25 .74 .92
Flanker 32 4.59 (3.12) 4.38 (3.19) .83 .41 .15 .94 .92
List sorting 26 7.50 (4.11) 8.30 (4.47) -.85 .40 .36 .93 .86
Oral reading 34 901.21 (622.51) 916.91 (604.02) -.29 .78 .05 .93 .97
Pattern comparison 20 28.65 (11.49) 30.08 (13.17) −1.62 .12 .17 .86 .84
Picture sequence memory 30 394.84 (99.23) 404.15 (106.48) -.38 .70 .07 .28a .76
Picture vocabulary 36 914.08 (310.58) 885.14 (294.72) 1.16 .25 .19 .94 .81
  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
  2. aUnlike study 2, alternate forms A and B were used at each visit (random order)
  3. bZelazo and Bauer [59]