For the PD group (Table 3), of the five inflammatory markers considered, levels of CRP and IL-6 were significantly raised (p-values 0.015 and 0.003, respectively) in PD-MCI cases compared to those without cognitive impairment, and the composite inflammatory score of PD-MCI participants at baseline was significantly higher (p = 0.006) (Table 3). Here, IL6 is linked to Parkinson disease.