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  • Title: Behavior disturbance in 8-year-old children with early treated phenylketonuria. Report from the MRC/DHSS Phenylketonuria Register.
    Author: Smith I, Beasley MG, Wolff OH, Ades AE.
    Journal: J Pediatr; 1988 Mar; 112(3):403-8. PubMed ID: 3346777.
    Abstract:
    Using the Rutter Behavior Questionnaire, schoolteachers assessed the frequency of common abnormal behavior in 544 8-year-old children with phenylketonuria who were born in the United Kingdom and in whom the diagnosis was made by routine testing in infancy, either during the early years of screening (cohort 1, births 1964 to 1971) or after a national reorganization of the program (cohort 2, births 1972 to 1977). All children received treatment before 4 months of age. Two matched control subjects were assessed for each patient. Compared with the controls, patients in cohorts 1 and 2 receiving a strict low-phenylalanine (phe) diet (average phe concentration less than 600 mumol/L) were 1.5 and 1.7 times, respectively, more likely to have deviant behavior; those receiving a less well controlled diet were 2.5 and 1.9 times, respectively, more likely to show such behavior. Patients more often had mannerisms, hyperactivity, and signs of anxiety and were less responsive and more solitary than were controls. On the other hand, they were not more aggressive, untruthful, or disobedient, nor absent from school more frequently. The increased frequency of deviant behavior may be the result of both psychologic stress and neurologic impairment.
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