. 2015 Nov 15;31(1):105–111. doi: 10.1093/arclin/acv066

Table 1.

Test–retest reliability^a

ImPACT score	Grade 9	Grade 11	ICC	ICC 95% CI		UER	t^b	p-value
ImPACT score	M (SD)	M (SD)	ICC	Lower	Upper	UER	t^b	p-value
Verbal Memory	84.7 (8.5)	83.9 (10.1)	0.210	0.077	0.335	0.353	−1.0	.33
Visual Memory	72.8 (12.2)	76.4 (12.3)	0.485	0.375	0.581	0.629	4.2	<.0001
Visual Motor Speed	36.4 (6.4)	40.2 (6.7)	0.719	0.648	0.779	0.746	11.1	<.0001
Reaction Time	0.60 (0.07)	0.58 (0.08)	0.458	0.345	0.558	0.598	−4.6	<.0001
Total Symptom	5.7 (10.0)	4.7 (7.2)	0.403	0.284	0.510	0.575	−1.6	.12

Notes: ^aICC=intraclass correlation coefficient; CI=confidence interval; UER=unbiased estimate of reliability; p, significance of t.

^bdf = 210; Bonferroni-corrected α p < .01.