Table 8.

Results of Negative Binomial Regressions Predicting 36-month ADOS Outcomes from 6-month MSEL T-scores

	Gross Motor			Fine Motor
	B	z	p	B	z	p
SA Severity	−0.0014	−0.34	.74	−0.012	−3.25	.001**
RRB Severity	−0.0002	−0.004	.60	−0.014	−3.59	<.001**
Total Severity	−0.0010	−0.22	.83	−0.015	−3.65	<.001**

Note.

^**p < .01. SA = Social Affect. RRB = Restricted and Repetitive Behaviors. Z = z statistic on the parameter estimate. For each one point increase in T-score, there was a corresponding change in the log of the ADOS outcome score of B. For example, an increase of Fine Motor t-score from 30 to 40 (ΔT = +10) points would result in a predicted total severity change of exp(ΔT x B) = exp(10 x −.015) = .860, or a 14% reduction.