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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.
abnoreye
under
Sleep Monitoring/Polysomnography/Signal Quality
in
SHHS variables
Scorer observed abnormal eye movements during study. Presence of the rhythmical lateral eye movements in Non-REM sleep, or asymmetrical or disconjugate movements.
quoxim
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.
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.