. Author manuscript; available in PMC: 2014 Oct 21.

Published in final edited form as: J Autism Dev Disord. 2012 Oct;42(10):2152–2161. doi: 10.1007/s10803-012-1467-2

Table 5.

Summary of hierarchical regression analyses for unengaged, supported joint, and coordinated joint engagement states (N = 55)

Variable	Unengaged β	Object β	Person β	Supported joint β	Coordinated joint β
Step 1	R² = .35^*	R² = .03	R² = .24^**	R² = .14^*	R² = .29^***
Autism diagnosis	.51^***	.16	−.48^***	−.31^*	−.31^*
Mental age	−.39^**	−.11	−.08	.26^*	.49^***
Step 2	R² = .66^*	R² = .72^***	R² = .61^**	R² = .50^***	R² = .75^***
Autism diagnosis	.27^**	.02	−.30^*	−.10	.001
Mental age	−.18	.18	−.25	.03	.17
Functional play	−.24^**	.72^***	−.16	.13	−.02
Symbolic play	−.05	−.05	.13	−.26^*	.20^*
Response to JA	−.11	−.17	−.16	−.13	.04
Initiations of JA	−.51^***	−.29^*	.32^*	.68^***	.69^***

p < .05,

^**

p < .01,

^***

p < .001