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lgbreath
under
Sleep Monitoring/Polysomnography/Signal Quality/SHHS1
in
SHHS variables
When very large breaths (one or two) occur periodically (mostly on the inductance channels) between runs of fairly normal breaths for a duration of at least 10 minutes.
staging5
under
Sleep Monitoring/Polysomnography/Signal Quality/SHHS1
in
SHHS variables
When the technical quality of the EEG does not allow distinction between sleep stages, but allows a differentiation between sleep and wake. The time considered sleep will be marked as Stage 2. No arousals will be scored for these studies.
overall_shhs1
under
Sleep Monitoring/Polysomnography/Signal Quality/SHHS1
in
SHHS variables
Overall study grade as assigned by scorer. The overall quality grade is based on the quality and duration of EEG, respiratory and oximetry signals. Based on signal quality during recording time. Studies are given a study code varying from outstanding to fair. If interested in studies of the best quality, overall quality scores of Very Good, Excellent and Oustanding can be selected. This code reflects the total duration of useable (artifact free, scorable) signals across channels, weighing those signals most critical for accurate scoring of respiratory events and staging.
Age at time of study in years, based on start date of Sleep Heart Health Study Visit One (SHHS1) Polysomnography (PSG) recording. Values equal to 90 indicate an age of 90 or greater.