Table 11.

Study 2: comparison of ABAS-2 and ABAS-3 scaled scores by VCI; mean (SD)

	ABAS-2 VCI ≤ 75 (n = 57)	ABAS-3 VCI ≤ 75 (n = 57)	t value†	P value	Diff.	ABAS-2 VCI ≥ 76 (n = 297)	ABAS-3 VCI ≥ 76 (n = 297)	t value‡	P value	Diff.
ABAS subscales
Communication	4.04 (3.01)	5.26 (2.74)	3.30	0.002	1.22	6.86 (3.19)	7.77 (2.43)	5.91	<0.001	0.91
Community use	3.68 (3.20)	5.79 (2.46)	4.80	<0.001	2.11	5.48 (3.21)	7.30 (2.68)	10.59	<0.001	1.82
Functional academics	3.95 (2.68)	4.79 (2.19)	2.52	0.01	0.84	6.87 (3.06)	7.48 (2.40)	4.01	<0.001	0.61
Home living	4.19 (3.32)	6.28 (2.70)	5.32	<0.001	2.09	4.37 (3.09)	6.77 (2.41)	13.06	<0.001	2.40
Health and safety	5.18 (3.51)	5.95 (3.28)	1.88	0.07	0.77	7.34 (3.13)	7.73 (2.71)	2.08	0.04	0.39
Leisure	5.98 (3.46)	5.86 (2.96)	‒0.31	0.76	‒0.12	7.53 (3.06)	7.48 (2.86)	‒0.31	0.76	‒0.05
Self-care	4.89 (3.16)	6.74 (3.14)	5.40	<0.001	1.85	5.93 (2.79)	7.87 (2.66)	12.55	<0.001	1.94
Self-direction	3.58 (3.11)	5.46 (2.42)	4.49	<0.001	1.88	4.78 (3.15)	6.26 (2.27)	8.55	<0.001	1.48
Social	4.79 (4.20)	5.77 (3.01)	2.33	0.02	0.98	6.31 (3.65)	7.35 (2.76)	5.75	<0.001	1.04

ABAS, Adaptive Behavior Assessment System; Diff., difference score (ABAS-3 — ABAS-2); SD, standard deviation; VCI, Verbal Comprehension Index.

^†Degrees of fareedom = 56.

^‡Degrees of freedom = 296.s