[Treatment of phenylketonuria: psychological results of a 5-year follow-up study (author's transl)].

In addition to earlier reports findings of a psychological five-year-follow-up of PKU-children are presented. Intelligence and motor development of these children depend significantly on age at onset of therapy and quality of dietary control. After dietary treatment over several years older PKU-children with late onset of therapy display no structural change as far as cognitive and motor development are concerned. Furthermore, a psychodiagnostic approach is presented to predict quality of dietary control. Although this approach did not yet yeald positive results because of insufficient sample-size it should be applied to further studies in the future.