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ECG channel: Proportion of valid signal time
ecgqual
under Sleep Monitoring/Polysomnography/Signal Quality in
HEARTBEAT variables
Hours of usable ECG based on total recording time (TRT)
htdur
under Sleep Monitoring/Polysomnography/Signal Quality in
SOF variables
Has electrocardiogram (ECG) data (Sleep Heart Health Study Visit One (SHHS1))
ecg
under Administrative/SHHS1 in
SHHS variables
Quality of the heart rate signal
quhr
under Sleep Monitoring/Polysomnography/Signal Quality/SHHS2 in
SHHS variables
Sleep Heart Health Study Visit 2 (SHHS2)-These vary from 1 (poorest) to 5 (best) and reflect the proportion of sleep time the signals were useable.
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