Table 2.

Hierarchical regression analyses predicting PDDBI and GMDS from GA (Step 1), ABR Group (Step 2), AMA Slope scores at four months (Step 3).^† Columns show adjusted R², beta weights for GA, ABR, and AMA Slope, and overall model p values

PDDBI (n=74)	Adj. R2	GA β Step 1	ABR β Step 2	AMA Slope β Step 3	p
Autism Composite
Step 1	0.07	−0.29	---------	---------	.011
Step 2	0.19	−0.19	0.37	---------	.000
Step 3	0.25	−0.18	0.35	0.27	.000
Social Discrepancy
Step 1	0.09	0.32	---------	---------	.006
Step 2	0.21	0.21	−0.38	---------	.000
Step 3	0.36	0.20	−0.35	−0.40	.000
Semantic-Pragmatic Language Discrepancy
Step 1	0.03	0.20	---------	---------	.090
Step 2	0.12	0.12	−0.30	---------	.009
Step 3	0.18	0.10	−0.28	−0.29	.001
Expressive Social Communication Abilities Composite
Step 1	0.02	0.18	---------	---------	.135
Step 2	0.07	0.11	−0.25	---------	.034
Step 3	0.22	0.09	−0.22	−0.40	.000
Repetitive, Ritualistic, and Pragmatic Problems Composite
Step 1	0.06	−0.28	---------	---------	.017
Step 2	0.14	−0.20	0.30	---------	.002
Step 3	0.13	−0.19	0.29	.11	.004
GMDS (n=67)	Adj. R2	GA β Step 1	ABR β Step 2	AMA Slope β Step 3	p
Hearing and Speech
Step 1	0.06	0.28	---------	---------	.021
Step 2	0.13	0.19	−0.28	---------	.005
Step 3	0.19	0.15	−0.30	−0.28	.001
Performance
Step 1	0.02	0.19	---------	---------	.134
Step 2	0.02	0.15	−0.12	---------	.215
Step 3	0.02	0.13	−0.13	−0.13	.242

^†Italicized: p<.05; bold font: p<.01