Sleep Heart Health Study

Overall study grade as assigned by scorer. These codes reflected the total duration of useable (artifact free, scorable) signals during sleep time across channels, weighing those signals most critical for accurate scoring of respiratory events and staging during sleep time. The Quality Assessment Form for SHHS2 was modified so that the overall quality grade and the signal quality codes were based on signals during sleep time. Since events were only scored during sleep time this provided a more accurate assessment of signal quality during the actual time or scoring. This change would only have affected the quality grade of a small number of studies in SHHS1 where there was a significant amount of time awake with very good signals combined with very poor signals that occurred during sleep. The overall and signal quality grades are comparable between SHHS1 and SHHS2.

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

Scorer observed abnormal EEG during study.

Scorer observed abnormal eye movements during study. Presence of the rhythmical lateral eye movements in Non-REM sleep, or asymmetrical or disconjugate movements.

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

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

Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Useable data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake. Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Sleep latency will be considered reliable when a change in lights status (on/off) shows a clear transition (even if reversed- off to on) prior to the onset of sleep.

Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Hours of useable signal are rounded out to the lowest whole integer (e.g. 4.6 hours of useable data = 4).

Note: Recording time was formatted as an actual clock time, rather than as separate hour and minute variables

Sleep Hearth 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

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

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 data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake.

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

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 data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake.

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 data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake.

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 data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake.

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 data for EEG/EOG/EMG data is defined by the number of hours that sleep stages can be distinguished from awake.

Sleep Heart Health Study Visit 1 (SHHS1)-Vary from 1 (poorest) to 4 (best) and reflect the proportion of time the signals were useable.

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.

Sleep Heart Health Study Visit 1 (SHHS1)- 0= Appropriate/1= Not Appropriate. Note that the indication of lights being appropriate or not appropriate relates only to whether the light signal was working and does NOT infer anything about sleep latency or sleep onset 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.

Sleep Heart Health Study Visit One (SHHS1)-Vary from 1 (poorest) to 4 (best) and reflect the proportion of time the signals were useable.

indicate when the recording either started or ended in sleep

indicate when the recording either started or ended in sleep

"1: Yes", this indicates more than 30 minutes of the sleep period had either lost or unscorable EEG data

0: Unreliable 1:Reliable

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.

Scorer observed alpha intrusion on sleep during study.

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.

Due to problems with EEG signals, arousals were ignored in scoring.

Scorer noted that there was a problem scoring arousals.

Due to signal problems, scorer was unable to reliably assess arousals. The scoring of arousals was determined to be unreliable.

Scorer comments on signal quality issues observed.

Scorer observed periodic breathing for a period of at least 10 minutes during study.

Scorer observed periodic large breaths during study. 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.

Sleep Heart Health Study Visit 2 (SHHS2)- Lights are considered to have been calibrated appropriately if, at any time during the study, there is a clear transition (on recorded lights) from lights on to lights off. Otherwise, lights are considered not appropriate (including a light channel showing: no change throughout the study, reversed calibration and/or constant fluctuation from on to off throughout the study.) On studies with clear, but multiple, light transitions "lights off" will be marked at the first "off" transition that is maintained for at least 30 minutes. Light calibration will be considered reliable, but sleep latency will be unreliable. This method will be employed for all studies with the only exception being when onset of sleep occurs prior to the light change, in which "lights off" will be set at the onset of sleep.

Data was lost at the beginning of study due to unscorable signals. Variable not used for Sleep Heart Health Study Visit 1 (SHHS1)

Data was lost during the study.

Data was lost at end of study due to unscorable signals.

If a respiratory event greater than 150 seconds in duration was observed, scorer has verified that this value is real.

Scorer observed other outlying values.

Scorer observed periodic breathing for a period of at least 5 minutes during study.

Sleep Heart Health Study Visit 2 (SHHS2)- This sensor will be considered to have been calibrated appropriately if changes in position are visualized during the recording. 0=reliable. No variable available for Sleep Heart Health Study Visit 1 (SHHS1).

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.

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.

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.

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.

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. EEG/EOG/EMG data are defined by the number of hours that sleep stages can be distinguished from awake.

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. EEG/EOG/EMG data are defined by the number of hours that sleep stages can be distinguished from awake.

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. EEG/EOG/EMG data are defined by the number of hours that sleep stages can be distinguished from awake.

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. EEG/EOG/EMG data are defined by the number of hours that sleep stages can be distinguished from awake.

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. EEG/EOG/EMG data are defined by the number of hours that sleep stages can be distinguished from awake.

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.

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.

If Respiratory Disturbance Index (RDI) = 0, scorer has verified that this value is real.

Data was lost at the beginning of sleep period because recording began after sleep onset.

Data was lost at the end of sleep period because recording ended before wake.

Due to signal problems, scorer was unable to reliably assess arousals in stage rapid eye movement sleep (REM). The scoring of arousals in stage rapid eye movement sleep (REM) was determined to be unreliable.

Scorer noted that there was a problem differentiating rapid eye movement sleep (REM) and non-rapid eye movement sleep (NREM).

Due to signal problems, scorer noted that there was a problem scoring respiratory events.

Study was scored sleep/wake rather than with full sleep staging. This assessment is made by the scorer if there is not sufficient quality on EEG leads to do full R&K scoring. (0=no (full scoring); 1=yes (sleep/wake only)) Studies scored as sleep wake have all sleep stages scored using a default of Stage 2 and no arousals are scored.

Scorer noted that there was a problem differentiating stage 1 and stage 2 sleep.

Scorer noted that there was a problem differentiating stage 2 and stage 3/4 sleep.

Scorer observed unusual sleep staging. This is noted when there is no sleep in any particular stage (eg. no rapid eye movement sleep (REM)).

Scorer noted that there was a problem differentiating stage wake from stage sleep.