Calibration
The Epworth sleepiness scale has been validated primarily in obstructive sleep apnea, though it has also shown success in detecting narcolepsy and idiopathic hypersomnia. It is used to measure excessive daytime sleepiness and is repeated after the administration of treatment (e.g., CPAP) to document improvement of symptoms. In narcolepsy, the Epworth sleepiness scale has both a high specificity (100%) and sensitivity (93.5%).
The Epworth sleepiness scale has been used to compare the sensitivity and specificity of other similar measurements of sleep quality. The Pittsburgh Sleep Quality Index is a related scoring tool of sleep quality. Both scores are internally highly reproducible.
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