Table 2.

Correlation between Plasma Phe level, DASS Depression Score, DASS Anxiety Score, BMI, Salivary Serotonin, Salivary Cortisol, 2-year Average Phe, 2-year Average Tyr, and 2-year Average Phe:Tyr Ratio.

For these 9 parameters, the 36 possible correlation interactions are shown. Plasma Phe level was the only parameter that was normally distributed. Thus, the non-parametric Spearman's ρ correlation coefficient was determined for each of the correlation interactions. Phe = Phenylalanine; Tyr = Tyrosine; BMI = Body Mass Index (kg/m²); * (with grey shading) = statistically significant correlation (two-sided p-value <.05).