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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.
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.
apnhyppr
under
Sleep Monitoring/Polysomnography/Signal Quality/SHHS2
in
SHHS variables
Due to signal problems, scorer was unable to reliably distinguish between apnea and hypopnea events. The distinction between apnea and hypopnea was determined to be unreliable.