. Author manuscript; available in PMC: 2016 May 23.

Published in final edited form as: Autism Res. 2015 Feb 24;8(5):583–592. doi: 10.1002/aur.1474

Table 3.

Forward stepwise linear regression models for domain raw totals and calibrated domain scores

SA-Raw								SA-CSS

		R²	ΔF	df	B	SE B	β			R²	ΔF	df	B	SE B	β

Step 1		0.26	881.50	1, 2507				Step 1		0.02	51.69	1, 2507
	Constant				16.35	0.19			Constant				7.85	0.10
	Verbal IQ				−0.07	0.00	−0.51		Verbal IQ				−0.01	0.00	−0.14
Step 2		0.27	24.12	1, 2506				Step 2		0.02	6.39	1, 2506
	Constant				17.26	0.26			Constant				7.61	0.13
	Verbal IQ				−0.07	0.00	−0.51		Verbal IQ				−0.01	0.00	−0.14
	Age				−0.10	0.02	−0.08		Age				0.03	0.01	0.05
Step 3		0.27	6.39	1, 2505
	Constant				17.19	0.27
	Verbal IQ				−0.07	0.00	−0.51
	Age				−0.10	0.02	−0.08
	Mat Ed				0.40	0.16	0.04
RRB-Raw								RRB-CSS

		R²	ΔF	df	B	SE B	β			R²	ΔF	df	B	SE B	β

Step 1		0.19	569.34	1, 2507				Step 1		.029	74.13	1, 2507
	Constant				6.30	0.10			Constant				8.63	0.10
	Verbal IQ				−0.03	0.00	−0.43		Verbal IQ				−0.01	0.00	−0.17
Step 2		0.22	125.89	1, 2506				Step 2		.038	23.53	1, 2506
	Constant				7.39	0.14			Constant				9.11	0.14
	Verbal IQ				−0.03	0.00	−0.43		Verbal IQ				−0.01	0.00	−0.17
	Age				−0.01	0.00	−0.20		Age				−0.06	0.01	−0.10
Step 3		0.23	10.83	1, 2505				Step 3		.040	5.17	1, 2505
	Constant				7.65	0.16			Constant				9.15	0.14
	Verbal IQ				−0.02	0.00	−0.34		Verbal IQ				−0.01	0.00	−0.17
	Age				−0.01	0.00	−0.20		Age				−0.05	0.01	−0.09
	Nonverbal IQ				−0.01	0.00	−0.10		Gender				−0.24	0.11	−0.04

Note. SA=Social Affect domain; RRB=Restricted, Repetitive Behavior domain; CSS=Calibrated Severity Score. Mat Ed = Maternal Education (graduate/professional degrees vs. all others)