Table 4.

Pearson correlations between ABI domains and related instruments (N = 139 ASD participants)

Instrument	ABI domain
	Core ASD Symptoms	Social Communication	Restrictive Repetitive Behaviors	Mood & Anxiety	Self-regulation	Challenging Behavior
ADOS-2 Comparison Score	0.17	0.20	0.09	− 0.14	0.04	− 0.02
SRS-2 (Parent)
Total Score	0.81	0.66	0.73	0.49	0.43	0.31
Social communication and interaction	0.80	0.69	0.68	0.46	0.39	0.27
Restricted interests and repetitive	0.72	0.49	0.75	0.50	0.49	0.38
CASI-4R Anxiety Scale Score	0.53	0.32	0.59	0.77	0.33	0.21
RBS-R Overall Score	0.67	0.40	0.76	0.45	0.51	0.40
ABC—Community
Irritability	0.49	0.28	0.56	0.57	0.64	0.76
Social withdrawal	0.66	0.66	0.47	0.33	0.12	0.14
Stereotypic Behavior	0.57	0.39	0.59	0.34	0.53	0.41
Hyperactivity/noncompliance	0.43	0.24	0.51	0.35	0.88	0.55
Inappropriate speech	0.56	0.33	0.65	0.39	0.64	0.48
ZBI Total Score	0.29	0.14	0.36	0.41	0.35	0.47
ABI-S	0.92	0.84	0.93	0.91	0.93	0.94

Bold indicates pre-specified variables showing convergent validity

ABC-Community Aberrant Behavior Checklist-Community; ADOS-2 Autism Diagnostic Observation Schedule, 2nd edition, comparison score; CASI-4R Anxiety Child and Adolescent Symptom Inventory 4R, Anxiety Subscale, RBS-R Repetitive Behavior: Repetitive Behavior Scale—Revised; SRS-2 Social Responsiveness Scale-2; ZBI Zarit Burden Interview SRS-2, ABI-S Autism Behavior Inventory—Short form