[The diagnostic value of the intelligence quotient in learning disabilities]

In 1983-88 period, 206 subjects with a average age of 9 years and 6 months, referred [correction of envoied] to our service for learning disabilities, have been submitted to neuropsychiatric visit with a psychometric evaluation, I.Q. included, by which a neuropsychological diagnosis has been expressed. The distribution curves of I.Q. of different diagnostic groups (neurosis, psychosis, specific learning disability with and without sociocultural deprivation, central neuromotor damage, psychomotor delay, Down syndrome, mental retardation) have been examined. The analysis shows that only subjects with central neuromotor damage, psychomotor delay, Down syndrome, mental retardation have an I.Q. less than or equal to 70. The anamnesis and clinical evaluation consent to assert an "organic" etiopathogenesis in 9 of 20 subjects with mental retardation. Therefore for diagnostic evaluation of children with learning disabilities seems useful to perform always an I.Q. and, when I.Q. less than or equal to 70, to execute an instrumental examination to exclude an "organic" etiopathogenesis.