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Kaplan-Meier curves of psychosis by the severity of PD and by cognitive function. mH–Y; modified Hoehn–Yahr stage, MMSE; Mini-Mental State Examination. A. Patients with MMSE scores >24 (n = 162) and those with MMSE scores ≤24 (n = 116) were compared after exclusion of 56 patients because of missing values. B. Patients with a mH-Y stage of 1-3 (n = 201) and those with a mH-Y stage of 4-5 (n = 120) were compared after exclusion of 13 patients because of missing values.
