Probable DLB (n=80) Possible DLB (n=18) Male (%) 51 (64%) 9 (50%) Age at evaluation, yr (SD) 71 (8.2) 72.9 (9.3) Disease duration at evaluation, yr (SD) 2.59 (0.22) 2.19 (0.35) Education, yr (SD) 15.0 (0.4) 14.4 (0.8) Fulfilled McKeith criteria for probable DLB (%)* 55 (69%) 7 (39%) Clinical features Visual hallucination Spontaneous parkinsonism Resting tremors** Action or postural tremors Rigidity Bradykinesia Gait instability Fluctuation Dream enactment behavior Sleep talking Visuospatial difficulties Constipation Orthostatic lightheadedness   46 (57%) 51 (64%) 20 (25%) 8 (10%) 42 (52%) 34 (42%) 60 (75%) 21 (26%) 39 (49%) 23 (29%) 47 (59%) 17 (21%) 9 (11%)   7 (39%) 11 (61%) 10 (56%) 1 (6%) 11 (61%) 7 (39%) 12 (67%) 3 (17%) 4 (22%) 5 (28%) 9 (50%) 5 (28%) 0 Cognitive Z-scores at baseline Memory Executive Language Visuospatial Composite   -1.96 (0.18) -1.99 (0.13) -1.20 (0.12) -2.77 (0.16) -1.99 (0.12)   -1.84 (0.40) -2.01 (0.31) -1.37 (0.35) -2.77 (0.45) -2.00 (0.33)

Table 1: Baseline demographics of the cohort. Patients were included in the current study if they were assigned a diagnosis of "probable DLB" or "possible DLB" by their treating neurologists. Patients carrying the diagnosis of probable DLB were more likely to fulfill the McKeith criteria for probable DLB than patients carrying the diagnosis of possible DLB (* p = 0.029), and were much less likely to have resting tremors (** p = 0.02).