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ecgqual under Sleep Monitoring/Polysomnography/Signal Quality in HEARTBEAT variables
htdur under Sleep Monitoring/Polysomnography/Signal Quality in SOF variables
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.