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Sleep Heart Health Study

Name Label Folder
overall_shhs2
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Overall signal quality
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Overall signal quality

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.

Measurements/Polysomnography/Signal Quality/SHHS2
abdodur
Hours of usable abdominal signal
Hours of usable abdominal signal

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

Measurements/Polysomnography/Signal Quality
abnoreeg
Polysomnography (PSG) Quality Assessment : Abnormal EEG
Polysomnography (PSG) Quality Assessment : Abnormal EEG

Scorer observed abnormal EEG during study.

Measurements/Polysomnography/Signal Quality
abnoreye
Polysomnography (PSG) Quality Assessment : Abnormal Eye movements
Polysomnography (PSG) Quality Assessment : Abnormal Eye movements

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

Measurements/Polysomnography/Signal Quality
airdur
Hours of usable airflow signal
Hours of usable airflow signal

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

Measurements/Polysomnography/Signal Quality
chestdur
Hours of usable thoracic signal
Hours of usable thoracic signal

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

Measurements/Polysomnography/Signal Quality
chindur
Hours of usable chin signal
Hours of usable chin signal

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).

Measurements/Polysomnography/Signal Quality
eeg1dur
Hours of usable EEG1 signal
Hours of usable EEG1 signal

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).

Measurements/Polysomnography/Signal Quality
eeg2dur
Hours of usable EEG2 signal
Hours of usable EEG2 signal

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).

Measurements/Polysomnography/Signal Quality
eogldur
Hours of usable EOGL signal
Hours of usable EOGL signal

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).

Measurements/Polysomnography/Signal Quality
eogrdur
Hours of usable EOGR signal
Hours of usable EOGR signal

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).

Measurements/Polysomnography/Signal Quality
hrdur
Hours of usable heart rate signal
Hours of usable heart rate signal

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

Measurements/Polysomnography/Signal Quality
latreliable
Is the sleep latency reliable?
Is the sleep latency reliable?

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.

Measurements/Polysomnography/Signal Quality
oximdur
Hours of usable oximetry signal
Hours of usable oximetry signal

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

Measurements/Polysomnography/Signal Quality
posdur
Hours of usable position signal
Hours of usable position signal

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

Measurements/Polysomnography/Signal Quality
rcrdtime
Total recording time
Total recording time

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

Measurements/Polysomnography/Signal Quality
abdoqual
Quality of the abdominal signal
Quality of the abdominal signal

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

Measurements/Polysomnography/Signal Quality/SHHS1
airqual
Quality of the airflow signal
Quality of the airflow signal

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

Measurements/Polysomnography/Signal Quality/SHHS1
chinqual
Quality of the chin signal
Quality of the chin signal

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.

Measurements/Polysomnography/Signal Quality/SHHS1
chstqual
Quality of the thoracic signal
Quality of the thoracic signal

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

Measurements/Polysomnography/Signal Quality/SHHS1
eeg1qual
Quality of the EEG1 signal
Quality of the EEG1 signal

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.

Measurements/Polysomnography/Signal Quality/SHHS1
eeg2qual
Quality of the EEG2 signal
Quality of the EEG2 signal

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.

Measurements/Polysomnography/Signal Quality/SHHS1
eoglqual
Quality of the EOGL signal
Quality of the EOGL signal

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.

Measurements/Polysomnography/Signal Quality/SHHS1
eogrqual
Quality of the EOGR signal
Quality of the EOGR signal

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.

Measurements/Polysomnography/Signal Quality/SHHS1
hrqual
Quality of the heart rate signal
Quality of the heart rate signal

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

Measurements/Polysomnography/Signal Quality/SHHS1
lgbreath
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Periodic Large Breaths
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Periodic Large Breaths

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.

Measurements/Polysomnography/Signal Quality/SHHS1
lightoff
Lights appropriate?
Lights appropriate?

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.

Measurements/Polysomnography/Signal Quality/SHHS1
outliercheck1
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Extreme Values Found
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Extreme Values Found Measurements/Polysomnography/Signal Quality/SHHS1
outliercheck2
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Extreme values remain after review
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Extreme values remain after review Measurements/Polysomnography/Signal Quality/SHHS1
overall_shhs1
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit One (SHHS1)): Overall signal quality
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit One (SHHS1)): Overall signal quality

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.

Measurements/Polysomnography/Signal Quality/SHHS1
oximqual
Quality of the oximetry signal
Quality of the oximetry signal

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

Measurements/Polysomnography/Signal Quality/SHHS1
respscch
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Predominant (>=75%) Channel for Scoring Respiratory. Variable not used for Sleep Heart Health Study Visit 2 (SHHS).
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Predominant (>=75%) Channel for Scoring Respiratory. Variable not used for Sleep Heart Health Study Visit 2 (SHHS). Measurements/Polysomnography/Signal Quality/SHHS1
restan1
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Was entire record scored
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Was entire record scored Measurements/Polysomnography/Signal Quality/SHHS1
restan2
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scoring started after sleep onset
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scoring started after sleep onset

indicate when the recording either started or ended in sleep

Measurements/Polysomnography/Signal Quality/SHHS1
restan3
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scoring ended before lights on/awake
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scoring ended before lights on/awake

indicate when the recording either started or ended in sleep

Measurements/Polysomnography/Signal Quality/SHHS1
restan4
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Intervening period bad EEG
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Intervening period bad EEG

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

Measurements/Polysomnography/Signal Quality/SHHS1
restan5
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Intervening period bad Resp./Oximetry
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Intervening period bad Resp./Oximetry Measurements/Polysomnography/Signal Quality/SHHS1
staging1
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Study scored with minimal problems
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Study scored with minimal problems Measurements/Polysomnography/Signal Quality/SHHS1
staging2
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): rapid eye movement sleep (REM)/non-rapid eye movement sleep (NREM) unreliable
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): rapid eye movement sleep (REM)/non-rapid eye movement sleep (NREM) unreliable Measurements/Polysomnography/Signal Quality/SHHS1
staging3
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scored Wake, non-rapid eye movement sleep (NREM), rapid eye movement sleep (REM) only
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scored Wake, non-rapid eye movement sleep (NREM), rapid eye movement sleep (REM) only Measurements/Polysomnography/Signal Quality/SHHS1
staging4
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Arousals Unreliable
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Arousals Unreliable Measurements/Polysomnography/Signal Quality/SHHS1
staging5
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scored Sleep-Wake only
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Scored Sleep-Wake only

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.

Measurements/Polysomnography/Signal Quality/SHHS1
staging6
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Staging 6
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Staging 6 Measurements/Polysomnography/Signal Quality/SHHS1
staging7
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Rapid eye movement sleep (REM) Arousals (only) unreliable
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Rapid eye movement sleep (REM) Arousals (only) unreliable Measurements/Polysomnography/Signal Quality/SHHS1
staging8
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Wake-Sleep unreliable
Polysomnography (PSG) Scoring Notes (Sleep Heart Health Study Visit One (SHHS1)): Wake-Sleep unreliable Measurements/Polysomnography/Signal Quality/SHHS1
alpdel
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Alpha Intrusion
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Alpha Intrusion

Scorer observed alpha intrusion on sleep during study.

Measurements/Polysomnography/Signal Quality/SHHS2
apnhyppr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Apnea/Hypopnea scoring problems
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Apnea/Hypopnea scoring problems

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.

Measurements/Polysomnography/Signal Quality/SHHS2
aroign
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals Ignored
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals Ignored

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

Measurements/Polysomnography/Signal Quality/SHHS2
aropr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Problems with arousals
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Problems with arousals

Scorer noted that there was a problem scoring arousals.

Measurements/Polysomnography/Signal Quality/SHHS2
arunrel
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals unreliable
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals unreliable

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

Measurements/Polysomnography/Signal Quality/SHHS2
comm
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Signal Quality comments
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Signal Quality comments

Scorer comments on signal quality issues observed.

Measurements/Polysomnography/Signal Quality/SHHS2
csbre
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic breathing (10 minutes)
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic breathing (10 minutes)

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

Measurements/Polysomnography/Signal Quality/SHHS2
lagbreath
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic large breaths
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic large breaths

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.

Measurements/Polysomnography/Signal Quality/SHHS2
ligh
Was the light sensor calibrated appropriately?
Was the light sensor calibrated appropriately?

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.

Measurements/Polysomnography/Signal Quality/SHHS2
losbeg
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost at beginning of study
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost at beginning of study

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

Measurements/Polysomnography/Signal Quality/SHHS2
losdur
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost during study
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost during study

Data was lost during the study.

Measurements/Polysomnography/Signal Quality/SHHS2
losend
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost at end of study
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost at end of study

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

Measurements/Polysomnography/Signal Quality/SHHS2
maxresou
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Long respiratory events verified
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Long respiratory events verified

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

Measurements/Polysomnography/Signal Quality/SHHS2
otherou
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Other outlier
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Other outlier

Scorer observed other outlying values.

Measurements/Polysomnography/Signal Quality/SHHS2
period
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic breathing (5 min)
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Periodic breathing (5 min)

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

Measurements/Polysomnography/Signal Quality/SHHS2
posn
Was the position sensor working properly?
Was the position sensor working properly?

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).

Measurements/Polysomnography/Signal Quality/SHHS2
posqual
Quality of the position signal
Quality of the position signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quabdo
Quality of the abdominal signal
Quality of the abdominal signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quair
Quality of the airflow signal
Quality of the airflow signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quchest
Quality of the thoracic signal
Quality of the thoracic signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quchin
Quality of the chin signal
Quality of the chin signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
queeg1
Quality of the EEG1 signal
Quality of the EEG1 signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
queeg2
Quality of the EEG2 signal
Quality of the EEG2 signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
queogl
Quality of the EOGL signal
Quality of the EOGL signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
queogr
Quality of the EOGR signal
Quality of the EOGR signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quhr
Quality of the heart rate signal
Quality of the heart rate signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
quoxim
Quality of the oximetry signal
Quality of the oximetry signal

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.

Measurements/Polysomnography/Signal Quality/SHHS2
rdi0ou
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Respiratory Disturbance Index (RDI)=0 real
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Respiratory Disturbance Index (RDI)=0 real

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

Measurements/Polysomnography/Signal Quality/SHHS2
recafsle
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost - Recording began after sleep
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost - Recording began after sleep

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

Measurements/Polysomnography/Signal Quality/SHHS2
recbeaw
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost - Recording ended before wake
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Data Lost - Recording ended before wake

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

Measurements/Polysomnography/Signal Quality/SHHS2
remarunrel
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals unreliable (Rapid eye movement sleep (REM))
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Arousals unreliable (Rapid eye movement sleep (REM))

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.

Measurements/Polysomnography/Signal Quality/SHHS2
remnrempr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): rapid eye movement sleep (REM)/non-rapid eye movement sleep (NREM) Scoring unreliable
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): rapid eye movement sleep (REM)/non-rapid eye movement sleep (NREM) Scoring unreliable

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

Measurements/Polysomnography/Signal Quality/SHHS2
respevpr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Respiratory scoring problems
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Respiratory scoring problems

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

Measurements/Polysomnography/Signal Quality/SHHS2
slewake
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Sleep Wake Scoring
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Sleep Wake Scoring

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.

Measurements/Polysomnography/Signal Quality/SHHS2
stg1stg2pr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Stage1/Stage2 Scoring unreliable
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Stage1/Stage2 Scoring unreliable

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

Measurements/Polysomnography/Signal Quality/SHHS2
stg2stg3pr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Stage2/Stage3-4 Scoring unreliable
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Stage2/Stage3-4 Scoring unreliable

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

Measurements/Polysomnography/Signal Quality/SHHS2
unustgou
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Unusual Staging
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Unusual Staging

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

Measurements/Polysomnography/Signal Quality/SHHS2
wakslepr
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Wake/Sleep Scoring unreliable
Polysomnography (PSG) Quality Assessment (Sleep Heart Health Study Visit Two (SHHS2)): Wake/Sleep Scoring unreliable

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

Measurements/Polysomnography/Signal Quality/SHHS2