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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: J Am Acad Child Adolesc Psychiatry. 2011 Nov 21;51(1):28–40.e3. doi: 10.1016/j.jaac.2011.09.021

Figure 1.

Figure 1

Two-factor/two-class model using the Social Responsiveness Scale in the total available sample (N=6,949) and non-autism spectrum disorder (ASD) sibling sub-sample (N=2,701). Note: The ASD class had substantially higher symptom levels (t-scores) than the non-ASD class in both the total sample and non-ASD sibling sub-sample (p<.001). Non-ASD sibs designate model results for the non-ASD sibling sub-sample. SC 1–4=social communication/interaction scales from the Social Responsiveness Scale. AM 1–4=autism mannerisms item packets from the Social Responsiveness Scale. Horizontal black line separates results for the empirically-derived ASD and non-ASD classes. Curved double-headed arrows represent factor correlations in the ASD and non-ASD classes.