Table 5.

Linear regression analyses for boys with fragile X syndrome predicting language ability

	B (unstandardized)	SEB	β	p value
Receptive vocabulary—PPVT raw score
Chronological age	13.38	1.56	0.88	<0.001*
Nonverbal IQ	1.29	0.25	0.57	<0.001*
Social affective symptom severity	2.97	1.26	0.22	0.02*
Restricted and repetitive behavior symptom severity	−3.71	1.80	−0.19	0.04*
Expressive vocabulary—EVT-2 raw score
Chronological age	11.41	1.13	0.94	<0.001*
Nonverbal IQ	0.98	0.18	0.53	<0.001*
Social affective symptom severity	1.90	0.92	0.18	0.04*
Restricted and repetitive behavior symptom severity	−2.45	1.33	−0.15	0.07
Receptive grammar—TROG-2 total number of items correct
Chronological age	3.79	0.57	0.74	<0.001*
Nonverbal IQ	0.44	0.09	0.57	<0.001*
Social affective symptom severity	1.31	0.46	0.29	0.006*
Restricted and repetitive behavior symptom severity	−2.05	0.65	−0.30	0.003*
Expressive grammar—CASL syntax construction raw score (transformed)1
Chronological age	0.42	0.06	0.83	<0.001*
Nonverbal IQ	0.04	0.01	0.53	<0.001*
Social affective symptom severity	0.04	0.05	0.10	0.41
Restricted and repetitive behavior symptom severity	−0.09	0.07	−0.13	0.22

¹Because of the presence of non-constant variance in the residuals, this model data transformed using a natural log transformation

^*p < .05