Childhood Disorders Mental Retardation: Characterized by significantly Sub average intellectual functioning (IQ of 70 or Below) with onset before age 18. Mild- IQ 50-55 to 70; educable 318.0 Moderate- 35-40 to 50-55; trainable 318.1 Severe- 20-25 to 35-40; little speech 318.2 Profound- below 20-25 319 Mental Retardation, severity unspecified. Learning Disorders: Characterized by […]