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Table 3 Pair-wise epoch by epoch agreement by SDB group

From: Retrospective cross-validation of automated sleep staging using electroocular recording in patients with and without sleep disordered breathing

  Automated staging   
  Normal and Mild SDB (n = 40,641 epochs)   %
  Wake N1 N2 N3 REM Total No. epochs Epochs
Wake 79.7% 9.2% 7.7% 0.8% 2.6% 100% 7342 18.1%
NREM1 24.7% 25.1% 38.4% 0.6% 11.2% 100% 5436 13.4%
NREM2 6.2% 7.6% 77.7% 6.0% 2.4% 100% 18167 44.7%
NREM3 1.8% 0.0% 13.5% 83.9% 0.9% 100% 4234 10.4%
REM 4.9% 6.6% 12.4% 1.4% 74.6% 100% 5462 13.4%
No. epochs 8663 3793 18019 4817 5349    
% epochs 21.3% 9.3% 44.3% 11.9% 13.2%    
Kappa 0.67 0.21 0.60 0.76 0.72    
Moderate and Severe SDB (n = 29,938 epochs)
  Wake N1 N2 N3 REM Total   
Wake 71.1% 16.9% 8.1% 0.3% 3.6% 100% 9086 22.4%
NREM1 18.9% 30.0% 40.3% 0.4% 10.5% 100% 6955 17.1%
NREM2 8.6% 14.1% 70.5% 4.1% 2.7% 100% 10205 25.1%
NREM3 7.1% 0.0% 26.7% 65.0% 1.1% 100% 1077 2.7%
REM 4.5% 10.8% 15.9% 1.4% 67.4% 100% 2615 6.4%
No. epochs 8851 5349 11430 1204 3104    
% epochs 29.6% 17.9% 38.2% 4.0% 10.4%    
Kappa 0.60 0.17 0.48 0.60 0.58