Facts To Know!! Intellectual disability ranges from mild, moderate to severe and profound Fetal alcohol syndrome is a preventable cause of intellectual disability Intellectual disability affects around one per cent of the total population, more than 80% of those have mild symptoms. IQ or intelligence quotient is a quantifiable measure of intelligence A person is considered intellectually disabled if his/her IQ is less than 75 and intellectually gifted if his/her IQ is above 110 Intellectual Disability Watch short video introduction on what Intellectual Disability looks like.