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Table 1 Demographic and clinical variables a

From: Abnormal daytime sleepiness in dementia with Lewy bodies compared to Alzheimer’s disease using the Multiple Sleep Latency Test

Variables DLB AD dementia F/χ2 P-value
No. of participants 61 26   
Males, % 84% 62% 5.0 0.03
Age, yr 70.5 ± 7 70.8 ± 8 0.04 0.84
Education, yr 14.6 ± 3 14.8 ± 3 0.12 0.73
Estimated duration of cognitive impairment, yr 3.6 ± 2 4.6 ± 4 2.4 0.12
Mini Mental State Examination score 23.4 ± 5 23.4 ± 4 0.004 0.95
Global Deterioration Scale score 3.9 ± 1 3.7 ± 1 0.44 0.51
Visual hallucinations, % 59% 8% 19.5 <0.01
Estimated duration of visual hallucinations, yr 2.1 ± 2 2.0 ± 1 0.008 0.93
Parkinsonism, % 84% 0%
Estimated duration of parkinsonism, yr 2.7 ± 3
Unified Parkinson’s Disease Rating Scale score 10.4 + 8 0.35 + 1 29.0 <0.01
Probable RBD, % 90% 3.8%
Estimated duration of RBD, yr 10.2 ± 11 2
Mayo Fluctuations Scale score >2, % 81% 21% 26.7 <0.01
Epworth Sleepiness Scale, informant 13.0 ± 6 8.3 ± 5 11.4 <0.01
Geriatric Depression Scale Score 4.6 ± 3.8 2.0 ± 1.5 9.3 <0.01
NPI-Q depression, informant report, % 36% 30% 0.19 0.66
  1. aValues represent mean ± standard deviation, except where indicated otherwise. AD dementia, Alzheimer’s disease dementia; DLB, Dementia with Lewy bodies; NPI-Q, Neuropsychiatric Inventory Questionnaire–Short Form; RBD, Rapid eye movement sleep behavior disorder. We used Fisher’s exact test in χ2 comparisons with less than five per cell, and no statistical comparisons were made with one or less per cell.