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

Table 2.

Reliable change indices (RCI)

ImPACT score	Grade 9	Grade 11	SEM^9a	SEM^11a	Sdiff^b	80% CI^c	95% CI^c
ImPACT score	M (SD)	M (SD)	SEM^9a	SEM^11a	Sdiff^b	80% CI^c	95% CI^c
Verbal Memory	84.7 (8.5)	83.9 (10.1)	7.53	8.99	9.92	69.34	91.04
Visual Memory	72.8 (12.2)	76.4 (12.3)	8.75	8.80	10.75	71.23	92.45
Visual Motor Speed	36.4 (6.4)	40.2 (6.7)	3.41	3.53	4.65	66.04	88.21
Reaction Time	0.60 (0.07)	0.58 (0.08)	0.05	0.06	0.07	79.25	92.45
Total Symptom	5.7 (10.0)	4.7 (7.2)	7.59	5.47	6.54	77.36	84.91

Notes: ^aStandard error of measure at Grade 9 and Grade 11 = [SD×√(1−r_xy)].

^bStandard error of difference scores based on Chelune et al. (1993) √[(SEM₉²) + (SEM₁₁²)].

^cCI=confidence interval; numbers report the percentage of subjects with predicted change scores within cut-off (80% CI = 1.28, 95% = 1.96).