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eeg1dur under Sleep Monitoring/Polysomnography/Signal Quality in CFS variables
Number of hours of usable signal from EEG1 lead as assessed by scorer.
eeg1dur under Sleep Monitoring/Polysomnography/Signal Quality in SOF variables
eeg1dur under Sleep Monitoring/Polysomnography/Signal Quality in SHHS variables
Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).