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chstqual
under
Sleep Monitoring/Polysomnography/Signal Quality/SHHS1
in
SHHS variables
Sleep Heart Health Study Visit 1 (SHHS1)-Vary from 1 (poorest) to 4 (best) and reflect the proportion of time the signals were useable. Useable respiratory data is defined as the number of hours that abnormal breaths can be distinguished from normal breaths
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.
quabdo
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. Useable respiratory data is defined as the number of hours that abnormal breaths can be distinguished from normal breaths.
quchest
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. Useable respiratory data is defined as the number of hours that abnormal breaths can be distinguished from normal breaths.
abdodur
under
Sleep Monitoring/Polysomnography/Signal Quality
in
SHHS variables
Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4). Useable respiratory data is defined as the number of hours that abnormal breaths can be distinguished from normal breaths
chestdur
under
Sleep Monitoring/Polysomnography/Signal Quality
in
SHHS variables
Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4). Useable respiratory data is defined as the number of hours that abnormal breaths can be distinguished from normal breaths