Table 2.

Linear regression analyses evaluating between-group differences in language ability

	B (unstandardized)	SEB	β	p value
Receptive vocabulary—PPVT raw score
Chronological age	12.90	1.47	0.78	<0.001*
Nonverbal IQ	1.51	0.23	0.63	<0.001*
ASD symptom severity	1.07	1.40	0.70	0.77
Diagnostic group	−24.76	6.09	−0.38	<0.001*
Expressive vocabulary—EVT-2 raw score
Chronological age	10.72	1.13	0.81	<0.001*
Nonverbal IQ	1.28	0.18	0.66	<0.001*
ASD symptom severity	1.97	1.07	0.16	0.07
Diagnostic group	−16.86	4.69	−0.32	0.001*
Receptive grammar—TROG-2 total number of items correct1
Chronological age	4.12	0.60	0.68	<0.001*
Nonverbal IQ	0.58	0.09	0.66	<0.001*
ASD symptom severity	0.14	0.57	0.03	0.80
Diagnostic group	−2.57	2.48	−0.11	0.30
Expressive grammar—CASL syntax construction raw score
Chronological age	2.10	0.33	0.66	<0.001*
Nonverbal IQ	0.26	0.05	0.54	<0.001*
ASD symptom severity	0.23	0.32	0.08	0.47
Diagnostic group	−1.96	1.38	−0.16	0.16

¹Because of suggestion of some non-constant variance when examining the residuals, the model was also run utilizing a natural log transformation; the same pattern of findings was observed

^*p < .05