Skip to main content

Table 2 Reported sleep parameters determined by polysomnography and actigraphy

From: The feasibility and reliability of actigraphy to monitor sleep in intensive care patients: an observational study

Parameter Polysomnography (n = 46) Actigraphy (n = 46)
Total minutes analysed 37,938 37,938
Total sleep time: min (mean ± SD) 462.5 ± 341.3 508.8 ± 321.8
Wake time: min (mean ± SD) 308.2 ± 259.1 292 ± 234
Sleep fragmentation index (mean ± SD)   46.5 ± 19.7
% recording time asleep (mean ± SD) 41.8 ± 27.15 69.2 ± 19.4
Awakenings (mean ± SD) 43.3 ± 35.3 19.8 ± 19.3
Arousal index 14.3 ± 13.1  
Stage N1 (%) 10.4  
Stage N2 (%) 75.5  
SWS (%) 10  
REM (%) 4.1  
  1. SWS slow wave sleep, REM rapid eye movement