Table 3.

HLM Results for STEP 1 Data

Fixed Effects		Baseline (Model 1)	With L-2 Predictors (Model 2)	SD added (Model 3)
Initial Status	Intercept	71.95**	73.26**	71.09**
	Treatment	−4.52	1.88	1.97
	IQ		0.04	0.02
	ASD Severity		−0.55*	−0.50*
	Mental Health		−0.34	−0.19
	Self-Determination			0.59
Time 1 Slope	Intercept	0.62	2.16	0.54
	Treatment	4.64**	4.61*	5.45**
	IQ		−0.05	−0.06
	ASD Severity		0.18	0.18
	Mental Health		−0.10	0.02
	Self-Determination			0.34
Time 2 Slope	Intercept	1.94	1.32	1.07
	Treatment	−1.75	−2.65	−2.29
	IQ
	ASD Severity
	Mental Health
	Self-Determination
Variance Components
Level 1	Within-Person	47.64**	50.13**	50.45**
Level 2	In initial status	89.55**	27.94**	28.11**
	In Time 1 Slope	4.02~	0.99	0.31
	In Time 2 Slope	N.A. (fixed)	N.A. (fixed)	N.A. (fixed)

^**p<0.01

^*p<0.05

^~p<0.10

p values are based on t test for fixed effects parameters and z test for variance component parameters