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Table 2 Overnight polysomnography in the dementia with Lewy bodies and Alzheimer’s disease dementia groups a

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

  DLB AD dementia F/χ2 P-value
No. of participants 61 26   
Time in bed, min 488 ± 78 560 ± 65 17 <0.01
Total sleep time, min 348 ± 99 382 ± 77 2.43 0.12
Sleep efficiency, % 72 ± 18 69 ± 17 0.24 0.63
Initial sleep latency, min 27 ± 38 23 ± 20 0.26 0.61
Initial REM sleep latency, min 144 ± 101 140 ± 105 0.03 0.87
Stage N1, % total sleep time 12 ± 11 16 ± 12 1.9 0.17
Stage N2, % total sleep time 53 ± 16 53 ± 13 0.005 0.99
Stage N3, % total sleep time 22 ± 16 14 ± 9 5.6 0.02
Stage REM, % total sleep time 14 ± 12 17 ± 8 1.7 0.19
Arousal index/hr 25 ± 15 29 ± 17 0.88 0.35
Respiratory disturbance index/hr 10 ± 11 8 ± 12 0.55 0.46
Respiratory disturbance index ≥15, % 18% 15% 0.11 0.74
Movement-related arousals/hr 4.3 ± 7 5.8 ± 6 1.28 0.28
Spontaneous arousals/hr 8.7 ± 8 9.8 ± 8 0.32 0.57
Oxygen saturation, % 94 ± 2 95 ± 2 0.52 0.47
REM sleep without atonia, % 71% 8% 43.4 <0.01
Absence of REM sleep, % 19% 0%
  1. aValues represent mean ± standard deviation or percentage per group. Index values/hour reflect the number of arousals per total hours of sleep time. AD dementia, Alzheimer’s disease dementia; DLB, Dementia with Lewy bodies; REM, Rapid eye movement. We used Fisher’s exact test for χ2 comparisons with less than five per cell, and no statistical comparisons were made with one or less per cell.