The Five to Fifteen parent questionnaire (FTF) was developed to offer a neuropsychological dimension to the assessment of children with Attention Deficit/Hyperactivity Disorder and other child psychiatric disorders. The domains included in the FTF were motor skills, executive functions, perception, memory, language, social skills and learning, in addition to a domain for emotional and behavioural problems. The aim of the present study was to test the clinical validity and utility of the FTF with a main focus on discriminant and criterion validity. The clinical sample consisted of 155 clinically diagnosed children (ICD-10 criteria), 102 were tested with WISC-III. The parents rated their children independent of the diagnostic evaluation. The results were presented as profiles. These clinical profiles were compared to those of a Swedish norm sample consisting of 854 children from the age of five to fifteen. Results demonstrated that the profiles for the clinical groups were similar in forms and levels to those of the upper 10 percent of the norm sample (those with most difficulties). Five out of eight FTF domains discriminated significantly between diagnostic groups in the clinical sample. Influence of IQ, gender and age on the results were low. Three out of four relevant FTF domains correlated significantly with corresponding WISC-III indexes/measures. The clinical utility of individual children's profiles were demonstrated. On the whole, the findings supported the clinical validity and utility of the FTF.
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