Summary of the data used for both construction and validation of the autism classifier.

Full sets of answers to the Autism Diagnostic Instrument-Revised questionnaire were downloaded from the Autism Genetic Research Exchange (AGRE), the Simons Simplex Collection (SSC), and the Boston Autism Consortium (AC). The AGRE data were used for training, testing, and construction of the classifier. The SSC and AC data were used for independent validation of the resulting classifier. The table lists the total numbers of spectrum and non-spectrum individuals represented in each of the three data sets with a breakdown of age by quartiles.