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Table 4 Interrater reliability (Cohen's Kappa statistic) for Rechtschaffen and Kalesscoring for sleep technologists (16 recordings)

From: Characterisation of sleep in intensive care using 24-hour polysomnography: anobservational study

Sleep stage/state Technologists one and two, 18,644 epochs (95%CIa) Technologists two and three, 25,908 epochs (95% CI)
Stage 1 0.12 (0.10-0.13) 0.08 (0.06-0.10)
Stage 2 0.58 (0.46-0.72) 0.55 (0.54-0.56)
Stage 3/4 0.76 (0.70-0.82) 0.20 (0.14-0.23)
REMb 0.44 (0.39-0.49) 0.41 (0.36-0.44)
Sleep/wake 0.68 (0.65-0.69) 0.58 (0.55-0.59)
  1. aCI, confidence interval; bREM, rapideye movement.