Related Variables
co2dur |
Hours of usable carbon dioxide (CO2)
Hours of usable carbon dioxide (CO2) signal - requires use of calibrated channel type with upper and lower limits for valid signal |
Sleep/Polysomnography (PSG)/Capnography | |
apnhyppr |
Scoring Apnea/Hypopnea unreliable
1=Apnea/Hypopnea distinction unreliable (when airflow signal is artifactual or absent for over 20 % of scored respiratory events) |
Sleep/Polysomnography (PSG)/Respiratory Events/Indexes | |
respevpr |
Scoring respiratory events (Respiratory Disturbance Index (RDI)) unreliable
1=Problems with respiratory events (when due to the technical quality of the respiratory signals, distinctions between hypopneas and normal breaths are equivocal in over 20 % of scored events; also when the quality of the oximetry signal raises doubts about actual magnitude of desaturation linked with over 20 % of respiratory events (unstable baseline) |
Sleep/Polysomnography (PSG)/Respiratory Events/Indexes | |
abdodur | Hours of usable abdominal effort | Sleep/Polysomnography (PSG)/Signal Quality | |
abnoreeg |
Abnormal EEG background / waveforms
1=Unusual Occurrences - Abnormal EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
airdur | Hours of usable airflow | Sleep/Polysomnography (PSG)/Signal Quality | |
alpdel |
Physiologic alpha intrusion
1=Unusual Occurrences - Alpha intrusion |
Sleep/Polysomnography (PSG)/Signal Quality | |
artifact |
Total artifact time (Unscorable)
Total minutes of unscorable (artifact) data |
Sleep/Polysomnography (PSG)/Signal Quality | |
arunrel |
Scoring arousals unreliable
1=Arousals unreliable (when the technical quality of the study does not allow one to distinguish discrete increases in EEG frequency from background changes in EEG. EEG still may be of sufficient quality to score stages. Studies with the physiological alpha intrusion will have arousals scored regardless of difficulty) |
Sleep/Polysomnography (PSG)/Signal Quality | |
c3dur | Hours of usable C3 | Sleep/Polysomnography (PSG)/Signal Quality | |
c4dur | Hours of usable C4 | Sleep/Polysomnography (PSG)/Signal Quality | |
candur | Hours of usable cannula | Sleep/Polysomnography (PSG)/Signal Quality | |
capdur |
Hours of usable cap
Hours of usable cap signal - requires use of calibrated channel type with upper and lower limits for valid signal |
Sleep/Polysomnography (PSG)/Signal Quality | |
chestdur | Hours of usable chest effort | Sleep/Polysomnography (PSG)/Signal Quality | |
chindur | Hours of usable chin | Sleep/Polysomnography (PSG)/Signal Quality | |
eogldur | Hours of usable EOG L | Sleep/Polysomnography (PSG)/Signal Quality | |
eogrdur | Hours of usable EOG R | Sleep/Polysomnography (PSG)/Signal Quality | |
f3dur | Hours of usable F3 | Sleep/Polysomnography (PSG)/Signal Quality | |
f4dur | Hours of usable F4 | Sleep/Polysomnography (PSG)/Signal Quality | |
hrdur | Hours of usable heart rate | Sleep/Polysomnography (PSG)/Signal Quality | |
legldur | Hours of usable legL | Sleep/Polysomnography (PSG)/Signal Quality | |
legrdur | Hours of usable legR | Sleep/Polysomnography (PSG)/Signal Quality | |
losbeg |
Data lost - recording begain in sleep
1=data lost - loss at beginning of study |
Sleep/Polysomnography (PSG)/Signal Quality | |
m1dur | Hours of usable M1 | Sleep/Polysomnography (PSG)/Signal Quality | |
m2dur | hours of usable M2 | Sleep/Polysomnography (PSG)/Signal Quality | |
o1dur | Hours of usable O1 | Sleep/Polysomnography (PSG)/Signal Quality | |
o2dur | Hours of usable O2 | Sleep/Polysomnography (PSG)/Signal Quality | |
otherou |
Other outlier
1=Outlier - other |
Sleep/Polysomnography (PSG)/Signal Quality | |
overall | Overall study grade | Sleep/Polysomnography (PSG)/Signal Quality | |
oximdur | Hours of usable oximetry | Sleep/Polysomnography (PSG)/Signal Quality | |
period |
Periodic breathing >= 10 minutes
1=unusual occurrences - periodic breathing > 5 minutes |
Sleep/Polysomnography (PSG)/Signal Quality | |
psndur |
Hours of usable position
*All non-compumedics collected studies have position hand scored by scorer from notes supplied by site / none of position signals transfer in European Data Format (EDF) only numbers |
Sleep/Polysomnography (PSG)/Signal Quality | |
pwfdur | Hours of usable pleth wave form | Sleep/Polysomnography (PSG)/Signal Quality | |
quabdo | Quality of abdominal effort | Sleep/Polysomnography (PSG)/Signal Quality | |
quair | Quality of airflow | Sleep/Polysomnography (PSG)/Signal Quality | |
quc3 |
Quality of C3
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quc4 |
Quality of C4
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
qucan | Quality of cannula | Sleep/Polysomnography (PSG)/Signal Quality | |
qucap |
Quality of cap
usable mainly artifact free signal |
Sleep/Polysomnography (PSG)/Signal Quality | |
quchest | Quality of chest effort | Sleep/Polysomnography (PSG)/Signal Quality | |
quchin | Quality of chin | Sleep/Polysomnography (PSG)/Signal Quality | |
quco2 | Quality of carbon dioxide (CO2) | Sleep/Polysomnography (PSG)/Signal Quality | |
queogl | Quality of EOG L | Sleep/Polysomnography (PSG)/Signal Quality | |
queogr | Quality of EOG R | Sleep/Polysomnography (PSG)/Signal Quality | |
quf3 |
Quality of F3
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quf4 |
Quality of F4
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quhr | Quality of hr | Sleep/Polysomnography (PSG)/Signal Quality | |
qulegl | Quality of LegL | Sleep/Polysomnography (PSG)/Signal Quality | |
qulegr | Quality of LegR | Sleep/Polysomnography (PSG)/Signal Quality | |
qum1 |
Quality of M1
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
qum2 |
Quality of M2
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quo1 |
Quality of O1
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quo2 |
Quality of O2
Quality of EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
quoxim | Quality of oximetry | Sleep/Polysomnography (PSG)/Signal Quality | |
qupsn |
Quality of position
*position for all non-compumedics data hand scored from notes from site tech |
Sleep/Polysomnography (PSG)/Signal Quality | |
qupwf | Quality of pleth wave form | Sleep/Polysomnography (PSG)/Signal Quality | |
quref | Quality of reference | Sleep/Polysomnography (PSG)/Signal Quality | |
qusnor |
Quality of snore
Quality of snore microphone |
Sleep/Polysomnography (PSG)/Signal Quality | |
qusum |
Quality of SUM
Quality of SUM channel |
Sleep/Polysomnography (PSG)/Signal Quality | |
qut3 | Quality of T3 | Sleep/Polysomnography (PSG)/Signal Quality | |
qut4 | Quality of T4 | Sleep/Polysomnography (PSG)/Signal Quality | |
recbeaw |
Data lost - recording ended before waking
1=data Lost - recording ended before wake |
Sleep/Polysomnography (PSG)/Signal Quality | |
remarunrel |
Scoring arousals in rapid eye movement sleep (REM) (only) unreliable
1=arousals in rapid eye movement sleep (REM) unreliable (when EMG is artifactual or absent during all or rapid eye movement sleep (REM) portion of the study) |
Sleep/Polysomnography (PSG)/Signal Quality | |
slewake |
Study scored sleep wake = 1, all sleep scored stage 2
1=Study scored sleep wake |
Sleep/Polysomnography (PSG)/Signal Quality | |
snordur | Hours of usable snore | Sleep/Polysomnography (PSG)/Signal Quality | |
stg1stg2pr |
Scoring stage1/ stage 2 unreliable
1=Sleep staging problem - scoring stage1/stage2 unreliable (when K-complexes and sleep spindles do not have show their classical morphology and distinction between Stage 1 and Stage 2 is doubtful (characteristic for the studies with low voltage EEG)) |
Sleep/Polysomnography (PSG)/Signal Quality | |
stg2stg3pr |
Scoring stage2/ deep sleep unreliable
1=sleep staging problem - scoring stage2/stage3-4 unreliable (when distinction between Stage 2 and Deep Sleep is unreliable because of EEG artifact (usually due to the respiratory or sweat artifact on the EEG, and High Pass filter =1Hz used)) |
Sleep/Polysomnography (PSG)/Signal Quality | |
sumdur | Hours of usable SUM | Sleep/Polysomnography (PSG)/Signal Quality | |
t3dur |
Hours of usable T3
Hours of usable EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
t4dur |
Hours of usable T4
Hours of usable EEG |
Sleep/Polysomnography (PSG)/Signal Quality | |
wakslepr |
Scoring stage wake/sleep unreliable
1=Sleep staging problem - scoring wake/sleep unreliable (when the clarity of the EEG makes distinguishing the transition unreliable) |
Sleep/Polysomnography (PSG)/Signal Quality |