. Author manuscript; available in PMC: 2014 Apr 15.

Published in final edited form as: Am J Intellect Dev Disabil. 2012 Mar;117(2):90–102. doi: 10.1352/1944-7558-117.2.90

Table 3.

Effects of Regression Model Parameters Predicting CARS Outcomes

	Phase	Effect	Estimate	SE	t	p

Vagal tone (VT)	Toy play	Age	1.02	0.30	3.41	.002^a
		VT	2.39	1.45	1.65	.11
		Age × VT	−0.17	0.07	−2.65	.01^a

	Reactivity	Age	0.80	0.40	2.0	.06^a
		VT	3.42	2.02	1.7	.10
		Age × VT	−0.15	0.09	−1.7	.10

	Change	Age	0.19	0.08	2.34	.03^a
		VT	−0.60	2.40	−0.25	.80
		Age × VT	0.09	0.10	0.90	.38

Interbeat interval (IBI)	Toy play	Age	3.00	0.94	3.19	.004^a
		IBI	0.13	0.04	2.89	.008^a
		Age × IBI	−0.006	0.002	−3.08	.005^a

	Reactivity	Age	0.84	0.85	0.99	.33
		IBI	0.07	0.05	1.55	.13
		Age × IBI	0.002	0.002	−0.90	.38

	Change	Age	0.29	0.10	3.04	.005^a
		IBI	−0.08	0.06	−1.26	.22
		Age × IBI	0.005	0.003	1.87	.07

Note. CARS = Childhood Autism Rating Scale (Schopler, Reichler, & Renner, 1988).

Significant at p < .05.