Fig. 2.

ROC curves of models predicting PDD using baseline cognitive tests. 1SD = model using 1 SD cut-offs below controls, cognitive tests included MoCA, SRM, DV accuracy and PoA; 1.5SD = model using 1.5 SD cut-offs below controls, cognitive tests included MoCA, SRM and PoA; 2SD = model using 2 SD cut-offs below controls, cognitive tests included MoCA, PRM, DV accuracy, PoA and pentagons; Median = model using median scores as cut-off, cognitive tests included MoCA, PAL, DV accuracy and PoA; Pen and paper = model using median scores as cut-offs for MoCA and semantic fluency. ROC, Receiver operating Characteristic; PDD, Parkinson’s disease with dementia; SD, standard deviation; MoCA, Montreal Cognitive Assessment; SRM, spatial recognition memory; PRM, paired recognition memory; DV, Digit Vigilance; PAL, paired associated learning; PoA, power of attention.