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TABLE I

Statistical Calculations of Mental Retardation Com puted for the Total Population of the United States

Classification

Total No. of Mental Defectives

(*3% of 180,000,000) 5,000,000

% Distribution of
Institutionalized
Mental Defectives
Within Classification

No. of
Institutionalized
Mental Defectives
150,000

No. of Mental

Defectives in
Community
4,850,000

 

 

Severely Retarded

 

 

(Totally Dependent) € .1% of 180,000,000) 180,000 30% 45,000 (25% of 135,000 (75% of
IQ 0-19 ( 3.5% of 5,000,000) , Severely Retarded) Severely Retarded)
Moderately Retarded € 3% of 180,000,000) 540,000 50% 75,000 (*15% of 465,000 ( >» 85% of
(Trainable) (11.5% of 5,000,000) Moderately Retarded) Moderately Retarded).
IQ 20-49
Mildly Retarded € 2.3% of 180,000,000) 4,280,000 20% 30,000 (~1% of 4,250,000 (>99% of
(Educable) € 85% of 5,000,000) Mildly Retarded) Mildly Retarded)
IQ 50-70