Fig. 3

Relationship between blood Phenylalanine concentration, phenotype, and GPV. a Boxplot (median, 25th–75th percentile, 1.5 IQR) of the maximal blood Phe concentrations for three PKU phenotypes (cPKU, mPKU, MHP) in 125 of 131 Serbian PKU patients (for whom data was available). The black dots in the cPKU bar represent higher blood Phe concentration values, as previously documented in cPKU patients. b Contour plot showing the two-dimensional densities of maximal blood Phe concentrations and their associated GPVs for 125 PKU patients.