• Family history of neuropsychiatric disorders and advanced paternal age are risk factors for ASD in the offspring previously identified in the studies in Europe and North America. What is New: • To our knowledge, this is the first study documenting risk factors for ASD in the Asian population. • Our study supports previous findings of Western countries where risk factors for ASD tend to occur in the families with neuropsychiatric illnesses particularly if such disorders came from the paternal side of the child's family.