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Prevalence of vitamin D insufficiency in patients with Parkinson disease (PD), patients with Alzheimer disease (AD), and matched healthy controls. *P=.008 for PD patients vs controls and P=.05 for PD patients vs AD patients. †, P=.02 for patients with PD vs controls. 25[OH]D indicates 25-hydroxyvitamin D. (To convert 25(OH)D to nanomoles per liter, multiply by 2.496.)
