Further, CRP levels correlated with IL-8 and YKL-40 in the cohort as a whole (p ≤ 0.020, β ≥ 0.143), however when looking at the individual diagnostic groups, significant correlations only remained for IL-8 in PD (p = 0.010, β = 0.214). Here, CHI3L1 is linked to Parkinson disease.