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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.