Abstract
Trends in intellectual functioning before and after diet termination were examined in 30 children with PKU treated before 6 weeks of age and on a liberal diet for a mean of three years since the mean age of 59 months. Comparisons of trends in pre- and posttermination IQ scores with the linear spline technique revealed no significant differences. Comparisons of pretermination IQ scores with posttermination scores and scores from the most recent evaluation also yielded no significant differences. These data fail to support a relationship between termination of diet and impairment of intellectual functioning, at least during this period of observation.
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