Fig. 2From: One-year follow-up of B vitamin and Iron status in patients with phenylketonuria provided tetrahydrobiopterin (BH4)Change in Dietary Micronutrients over One Year by Response Group, < 18 years. *Indicates statistically significant change over one-year, using signed rank test, α =0.05. P values for change over time (responders): iron p = 0.004; folate p = 0.006Back to article page