Table 5.

Unique contributions of child and family factors to self-injurious symptoms.

	Younger age group (4 years < 10 years)		Older age group (10 years < 18 years)
	β	t	β	t
ASD symptoms	0.13	4.59***	0.17	4.65***
Age	0.04	1.52	−0.04	−1.20
Child sex	0.00	0.00	0.06	1.82
Verbal IQ	0.03	0.66	0.09	1.42
Nonverbal IQ	0.00	0.08	−0.16	−2.54*
Adaptive behavior	−0.18	−4.75***	−0.09	−1.66
Household income	−0.12	−5.20***	−0.07	−2.18*
RACE/ETHNICITY
African American	−0.01	−0.30	−0.08	−2.15*
Asian	−0.04	−1.69	−0.03	−0.80
White	−0.02	−0.84	−0.03	−0.71
GI symptoms	0.11	4.62***	0.04	1.39

^*p < 0.05.

^***p < 0.001. Self-injurious behavior assessed via the Self-Injurious Behavior subscale of the Repetitive Behavior Scale- Revised.