Assessment of Symptom Severity in Siblings with Autism Spectrum Disorder: Comparing Parental Report Versus Direct Observation Methods Using Multilevel Modeling
E. Duku, S. Georgiades, P. Szatmari, J. Cairney and K. Georgiades

Comparing Autism Screeners and Physician Surveillance Techniques At 18- and 24-Month Well Child Visits
K. C. Greer, A. B. Barber, A. Evans, J. M. Pierucci, K. M. Dickey, M. R. Klinger and L. G. Klinger

Do Developmental Profiles of Toddlers with ASD Differ Based on Sibling Status Vs. Clinical Referral?
C. A. Saulnier, K. Chawarska and A. Klin

Social Economic Status and the M-CHAT: Unreliable Results for Mothers with Low Education Level
A. Scarpa, N. M. Reyes, M. Patriquin, J. Lorenzi, T. A. Hassenfeldt, V. Desai and K. Kerkering

Identifying Subgroups within PDD-NOS
L. A. Brennan, D. A. Fein and M. Barton

Examining Sex Differences in Item Endorsement on the Modified Checklist for Autism in Toddlers (M-CHAT)
N. N. Ludwig, D. L. Robins and D. A. Fein

Using the DISCO to Understand Associated Symptoms and Associated Developmental Conditions (Withdrawn)
S. R. Leekam, J. Turk and I. A. van Berckelaer-Onnes

Simons Variation in Individuals Project: Characterizing the Phenotype of 16p11.2 Deletion Syndrome
E. Hanson, R. P. Goin-Kochel, J. A. Burko, B. M. Cerban, W. Chung, S. M. Kanne, A. Laakman, A. Lian Cavanagh, R. McNally Keehn, F. K. Miller, J. E. Olson, A. V. Snow, L. Green Snyder, J. E. Spiro, A. D. Stevens, N. Visyak, J. Tjernagel, J. R. Wenegrat and R. Bernier