IL4 and Parkinson disease: Concerning motor and non-motor symptoms in patients with PD, IL-4 was positively correlated with UPDRS II (r = 0.337, p < 0.05), NMSS (r = 0.354, p < 0.05), HAMD (r = 0.420, p < 0.01) and PDQ-39 (r = 0.423, p < 0.01) scores after correcting for sex and age, unless otherwise specified.