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Table 1 Patient characteristics for the control group and results of R&K analysis (number = 15)

From: Intensive care unit depth of sleep: proof of concept of a simple electroencephalography index in the non-sedated

Characteristics Control group, number = 15
Male/Female, number 8/7
Age, mean (SD), years 42.9 (16.2)
BMI, mean (SD) 28.8 (9.3)
ESSa score, mean (SD) 8.1 (4)
Average length of PSG, hours 19.9 (1.5)
TSTb, mean (SD), hours:minutes 7:50 (1:02)
Sleep latency, means (SD), minutes 23 (10)
Time spent in each stage, mean (SD), % of TSTb
REM 21 (4)
S1 11 (6)
S2 46 (9)
S3 12 (8)
S4 10 (5)
Sleep efficiencyc, mean (SD), % 93 (5)
  1. aThe Epworth Sleepiness Scale (ESS) is used to determine the level of daytime sleepiness. A score of 10 or more is considered sleepy, 18 or more is very sleepy. bTotal sleep time (TST) is the combined time spent in either sleep stage. cSleep efficiency is the ratio defined by the time spent asleep and the time spent in bed. BMI, body mass index; PSG, polysomnography; REM, rapid eye movement; R&K, Rechtschaffen and Kales; SD, standard deviation.