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It is not concluded whether the association between olfactory dysfunction and REM sleep behavior disorder (RBD) were worsen cognitive function in patients with Parkinson's disease (PD). We sought to evaluate the impact of these symptoms in PD. We examined 62 patients with PD using an olfactory test (Odor Stick Identification Test for Japanese OSIT-J) and polysomnography (PSG). We divided the patients into 3 groups PD with clinical RBD ( =32), PD with subclinical RBD ( =11), and PD with normal REM sleep ( =19). We compare