Table 3.

Unstandardized regression coefficients (B), standardized regression coefficients (β), t-values, p-values, and 95% confidence intervals (CI) for all cognitive variables and interactions for WIAT-II spelling. All cognitive variables were centered prior to analysis. Bold font indicates significant p-values using an alpha of .05.

Step	R2	Variable	B	β	t-value	p-value	95% CI
Step 1	.148	Group	6.569	.384	3.990	< .001	[3.299, 9.839]
Step 2	.470	Phonological Processing (PP)	2.421	.477	4.775	<.001	[1.414, 3.428]
		Speeded Naming (SN)	.960	.139	1.499	.137	[−0.312, 2.233]
		Working Memory (WM)	.890	.149	1.414	.161	[−0.360, 2.140]
Step 3	.522	PP x Group	.469	.084	.859	.393	[−0.616, 1.553]
		SN x Group	−.313	−.041	−.500	.618	[−1.559, 0.932]
		WM x Group	−1.686	−.609	−2.769	.007	[−2.896, −0.476]