diagnostic criteria
intellectual impairment - IQ <70
social or adaptive dysfunction
onset before age 18
Mild
IQ 50-69
Moderate
IQ 35-49
Severe
IQ 20-34
Profound
IQ <20
genetic causes
fragile X PKU prader-willi angelman down's syndrome
Acquired causes
infection - Rubella
hypoxic birth injury
head injury
fetal alcohol syndrome
assoc conditins
CP
autism
epilepsy