Appendix B

The content in this publication was current at the time it was published, but it is not being updated. The publication is provided for historical purposes only.​

Table 6. Relationship of Phenylalanine Hydroxylase Mutation to their Adult WAIS-R Intelligence Quotient Regardless of Parental IQ, Age of Diagnosis, and Treatment History

Mutation Severity
Number Median WAIS-R
Severe/Severe 31 95 (n=30)
Severe/Moderate 15 100
Severe/Mild 4 101
Severe/Unclassified 4 100
Moderate/Unclassified 1 80
In Process 11 89 (n=9)
Both Mutations Unclassified 1 116

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