Table 6.

Linear regression analyses for boys with nonsyndromic ASD predicting language ability

	B (unstandardized)	SEB	β	p value
Receptive vocabulary—PPVT raw score1
Chronological age	10.17	2.77	0.57	0.001*
Nonverbal IQ	1.85	0.42	0.68	<0.001*
Social affective symptom severity	−0.26	2.73	−0.01	0.92
Restricted and repetitive behavior symptom severity	1.93	3.58	0.08	0.59
Expressive vocabulary—EVT-2 raw score1
Chronological age	7.56	2.10	0.51	0.001*
Nonverbal IQ	1.68	0.31	0.76	<0.001*
Social affective symptom severity	0.44	2.05	0.03	0.83
Restricted and repetitive behavior symptom severity	4.97	2.69	0.25	0.07
Receptive grammar—TROG-2 total number of items correct1
Chronological age	3.69	1.15	0.50	0.003*
Nonverbal IQ	0.81	0.17	0.72	<0.001*
Social affective symptom severity	−1.38	1.13	−0.17	0.23
Restricted and repetitive behavior symptom severity	0.66	1.49	0.07	0.66
Expressive grammar—CASL syntax construction raw score (transformed)2
Chronological age	0.20	0.11	0.32	0.08
Nonverbal IQ	0.06	0.02	0.63	0.001*
Social affective symptom severity	−0.009	0.10	−0.01	0.93
Restricted and repetitive behavior symptom severity	0.07	0.14	0.09	0.60

¹One potential outlier was observed in the model. Results obtained after removing this outlier were similar to those reported here

²Because of the presence of non-constant variance in the residuals, this model data transformed using a natural log transformation

^*p < .05