CP and Parkinson disease: Concerning PD, increased of 1 μg/dL of iron (p = 0.031; OR = 1.06; 95% C.I. 1.01–1.11), of Cp:Tf ratio (p = 0.016; OR = 2.9; 95% C.I. 1.22–6.75) as well as being man instead of woman (p < 0.001; OR = 5.20; 95% C.I. 2.14–12.66) resulted in a higher risk of having PD, while the increase of Cp concentration (1 mg/dL) was a protection factor (p = 0.042; OR = 0.72; 95% C.I. 0.53–0.99).