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. Author manuscript; available in PMC: 2017 Apr 1.

Published in final edited form as: Res Dev Disabil. 2016 Jan 21;51-52:49–59. doi: 10.1016/j.ridd.2016.01.005

Table 3.

Hierarchical Regression Models for WIAT Written Expression Scores Predicting Academic Outcomes

	Step 1 Model Summary				Step 2 Model Summary
DV: Core Class GPA	B	SE	β	t	B	SE	β	t

	(2,275) = 49.62, R² = .27^***				F(3,274) = 35.30, R² = .28^*** ΔF(1,274) = 5.17, ΔR² = .01^*

Estimated IQ	.03	.01	.47	9.08^***	.03	.01	.39	6.27^***
Medication Status	.34	.10	.19	3.58^***	.34	.10	.19	3.63^***
Written Expression	--	--	--	--	.01	.01	.14	2.27^*

	Step 1 Model Summary				Step 2 Model Summary
DV: WFIRS Learning Score	B	SE	β	t	B	SE	β	t

	F(4,304) = 27.78, R² = .26^***				F(5,303) = 26.75, R² = .31^*** ΔF(1,303) = 16.85, ΔR² =.05^*

Estimated IQ	−.07	.01	−.31	−6.26^***	−.04	.01	−.18	−3.09^**
Inattentive Symptoms	.20	.04	.34	5.65^***	.20	.04	.36	6.05^***
Hyperactive Symptoms	.07	.03	.14	2.19^*	.06	.03	.12	1.90
ODD Symptoms	.01	.03	.02	0.35	.03	.03	.05	0.89
Written Expression	--	--	--	--	−.06	.01	−.24	−4.11^***

Note.

^*

p < .05.

^**

p < .01.

^***

p < .001.