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

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

	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
	Number	Visit 1, mean (SD)	Visit 2, mean (SD)	t	p	Cohen’s d	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	.28^a	.76
Picture vocabulary	36	914.08 (310.58)	885.14 (294.72)	1.16	.25	.19	.94	.81

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
^aUnlike study 2, alternate forms A and B were used at each visit (random order)
^bZelazo and Bauer [59]

ISSN: 1866-1955