Psychiatry Child psychiatry d3c211d9 Severe mental retardation is A 50 - 69 B 35 - 49 C 20 - 34 D Less than 20 High-Yield Explanation Mental retardation level IQ range Mild 50-69 Moderate 35-49 Severe 20-34 Profound < 20 (Ref: A sho textbook of psychiatry, Niraj Ahuja,7th edition, pg no 156)