Table 5.

Study 2: comparison of ABAS-2 and ABAS-3 standardised scores; mean (SD) (n = 572)

	ABAS-2	ABAS-3	t value†	P value	Cohen’s d	95% CI [lower, upper]	CCC, 95% CI [lower, upper]
GAC (SS)	72.87 (17.20)	79.56 (13.37)	12.75	<0.001	0.37	[5.66, 7.72]	0.61 [0.57, 0.66]
Conceptual (SS)	76.57 (15.66)	79.84 (12.77)	7.03	<0.001	0.20	[2.36, 4.18]	0.68 [0.64, 0.72]
Social (SS)	81.68 (17.22)	83.37 (14.59)	2.98	0.003	0.11	[0.57, 2.80]	0.64 [0.59, 0.68]
Practical (SS)	72.29 (19.10)	80.89 (13.92)	9.82	<0.001	0.47	[7.38, 9.82]	0.54 [0.49, 0.58]

Note. ABAS, Adaptive Behavior Assessment System; GAC, general adaptive composite; SD, standard deviation; SS, standard score.

^†Degrees of freedom = 571 for all t tests.