Absence of Substantial Copy Number Differences in a Pair of Monozygotic Twins Discordant for Features of Autism Spectrum Disorder

Table 1

Comparative evaluation of TWO and TWX according to Autism Diagnostic Interview-Revised (ADI-R).

	Threshold	TWO		TWX
		Score	Observation	Score	Observation
Social reciprocal interaction	10	29	Significant	11	Significant
Communication skills	8	13	Significant	11	Significant
Behavior patterns restricted, repetitive, and stereotyped	3	7	Significant	1	Nonsignificant
Developmental difficulties observed before 36 months or less	1	5	Significant	3	Significant