Autism Symptom Level
			Baseline	1-Month Follow-Up	4-Month Follow-Up
	Total n	ASD n	r	r	r
Training	192	42	.53	.42	.54
Testing	76	18	.49	.32	.54
Validation	77	22	.61	.53	.65
Testing + Validation	153	40	.55	.43	.58
Ages 3–8	64	20	.54	.48	.62
Ages 9+	89	20	.57	.37	.59
			ASD Diagnosis
			Baseline	1-Month Follow-Up	4-Month Follow-Up
	Total n	ASD n	AUC (SE)	AUC (SE)	AUC (SE)
Training	192	42	.809 (.036)	.735 (.041)	.804 (.039)
Testing	76	18	.790 (.066)	.693 (.073)	.755 (.081)
Validation	77	22	.857 (.050)	.790 (.067)	.883 (.051)
Testing + Validation	153	40	.821 (.041)	.744 (.049)	.815 (.048)
Ages 3–8	64	20	.806 (.060)	.730 (.072)	.836 (.062)
Ages 9+	89	20	.833 (.058)	.749 (.071)	.822 (.072)

Note. ASD=Autism Spectrum Disorder. All correlations are statistically significant, p<.01. The Training sub-sample included a randomly-selected 60% of all administration. The testing and validation sub-samples each consisted of a random selection of 20% of all administration. Autism Symptom Level is based on averaging scores on the social communication / interaction and restricted repetitive behavior scales of the neurobehavioral evaluation tool informant-report survey.