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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Curr Opin Clin Nutr Metab Care. 2014 Jan;17(1):61–68. doi: 10.1097/MCO.0000000000000002

Figure 2.

Figure 2

Probability of intelligence quotient (IQ) <85 at varying blood phenylalanine (phe) levels and phe measurement times. Blood phe levels were historical, that is measured more than one year prior to IQ testing, in children before age 6 or at or after age 6. There is moderate evidence for a threshold effect of a phe level of 400 μmole/L associated with IQs of <85. The probability of having an IQ <85 does not increase considerably above a blood phe level of 2,000 μmole/L. Adapted with permission from [3].