Children's Study Initiative

Devoted to Children with Learning Disabilities

Intelligence Quotient (IQ) = Mental age / chronological age x 100
Intelligence Quotient is expressed as percentage

Normal IQ: 85 – 110
Borderline intelligence: IQ between 70 – 84
Mild mental retardation: IQ between 50 -69
Moderate mental retardation: IQ between 35 – 49
Severe mental retardation: IQ between 20 – 34
Profound mental retardation: IQ less than 20

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