CRP and anemia (phenotype): Multivariate logistic regression analysis showed that Kyn/Trp was only predictive for anemia if the inflammatory markers CRP and neopterin were not included in the analysis (Z = −2.332 + 0.023 × Kyn/Trp ratio + 0.931 × CRP + 0.083 × neopterin; p = 0.186 for Kyn/Trp ratio, p < 0.001 for CRP, p = 0.081 for neopterin).