CRP and Parkinson disease: Serum and CSF CRP significantly correlated in HC (slope = 325 ± 86.9, F(1, 4) = 14.0; p = 0.02) and in PD (slope = 415.5 ± 26.6, F(1, 10) = 243.8; p < 0.0001), but the slopes did not differ between HC and PD subjects (t(16) = 1.28; p = 0.22) (a).