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Significant neuropsychiatric differences among iRBD, PD + RBD, PD-RBD and HC groups. RBD = rapid eye movement sleep behavior disorder; iRBD = idiopathic RBD; PD = Parkinson’s disease; HC = healthy comparators; HARS = Hamilton Anxiety Rating Scale; TAS-20 = Toronto Alexithymia Scale—20 item; TAS-20 F1 = difficulty identifying feelings; ARS = Apathy Rating Scale; and BDI = Beck Depression Inventory. * Significant difference (details are reported in Table 3).
