Definitive explanations on the associations between demographics and cause as well as the cure of Autism Spectrum Disorder (ASD) are yet to be known due to the unavailability of universal datasets and costeffective diagnostic measures. This study analyzed large ASD screening data to examine whether symptoms of ASD differ based on ethnicity. The result showed a significant difference in the Autism Quotient (AQ) scores based on ethnicity among children, adolescents, and adults. Higher internal consistency was recorded on self-reported cases. This study will advance understanding of the influence of demographics on ASD symptoms. It is suggested that future studies should improve the reliability of AQ as screening tool.