Table 2.

Group differences in play behaviors—negative binomial regression

Variable	B	SE of B	z
Total functional play
ASD	−.59	.21	−2.78*
Other delays	−.25	.22	−1.12
No delays	−.08	.17	−0.49
Constant	1.87	.13	13.98**
Object-directed functional play
ASD	−.31	.27	−1.14
Other delays	.02	.29	0.09
No delays	.04	.23	0.17
Constant	1.22	.18	6.74**
Self-directed functional play
ASD	−.70	.29	−2.42*
Other delays	−.79	.34	−2.32*
No delays	−.35	.23	−1.55
Constant	.79	.16	4.80**
Other-directed functional play
ASD	−3.26	1.49	−2.19*
Other delays	−.27	.62	−0.43
No delays	−.02	.48	−0.04
Constant	−.27	.37	−0.73
Symbolic play
ASD	−.24	.66	−0.37
Other delays	.20	.67	0.30
No delays	.30	.54	0.56
Constant	−.81	.43	−1.88***
Functional repetitive play
ASD	−.44	.35	−1.27
Other delays	−.53	.39	−1.37
No delays	−.47	.31	−1.53
Constant	2.02	.23	8.66**
Non-functional repetitive play
ASD	1.23	.37	3.37*
Other delays	.88	.41	2.18*
No delays	1.02	.33	3.07*
Constant	.81	.27	3.00*

TD control group served as the reference group

* p < .05

** p < .001

*** p < .1