Most common type of mental retardation -
The number of mild cases far exceed the severe and profound cases English statistics suggest that among 100 mentally handicaped persons 70 mild, 20 moderate, 5 severe cases WHO classification of Mental retardation(MR) mild MR...IQ 50-70 moderate MR ...35-49 severe MR..IQ 20-34 profound MR...IQ under 20 ref; (page no;582) 23rd edition of PARK&;s textbook of Preventive and Social medicine
Mild
Moderate
Severe
Profound
Social science, Mental health & Genetics