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In some PSGs the EEG is generally low in amplitude in all frequency ranges while in others it is high. The reasons for these differences could be technical (distance between active and reference electrode, electrode impedance), biological (e.g. age, skin or skull impedance) or some other reason Younes et al. 2021 (PubMed ID: 34156473). This index was recently found to be a risk factor for future development of dementia (Stone et al. 2018). In addition, it was found to be highly reproducible across 5 years of follow up. A high value also results in artifactually high spindle power and density and higher alpha intrusion. Search for all EEG variables within this dataset

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)

Scorer observed abnormal EEG during study.

Scorer observed abnormal EEG during study.

Percent of 3-sec epochs with alpha power >30mV2 Younes et al. 2021 (PubMed ID: 34156473)Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during total recording time. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Used (along with :min_orp_firsthalf_nrem:) to calculate :diff_orp:. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Average Odds Ratio Product (ORP) in all 30-s epochs during manually scored sleep stages. ORP is a continuous index of sleep depth and wake propensity. A value of 0 indicates very deep sleep, a value of 2.5 indicates full wakefulness. Search for all EEG variables within this dataset

Heart rate in repsonse to arousals. Search for all EEG variables within this dataset

Heart rate in repsonse to arousals. Search for all EEG variables within this dataset

Clinical Category as per Younes et al. 2021 (PubMed ID: 34156473)Search for all EEG variables within this dataset

Heart rate in repsonse to arousals. Search for all EEG variables within this dataset

Heart rate in repsonse to arousals. Search for all EEG variables within this dataset

Change in Odds Ratio Product (ORP) across the night, a greater increase in ORP from the beginning of to end of the night suggests more restorative sleep. Younes et al. 2020 (PubMed ID: 32729619). Source: :avg_orp_last120m_nrem: and :min_orp_firsthalf_nrem:. Search for all EEG variables within this dataset

Component of intraclass correlation, see :icc_rl_orp: for more information. Search for all EEG variables within this dataset

Component of intraclass correlation, see :icc_rl_orp: for more information. Search for all EEG variables within this dataset

Component of intraclass correlation, see :icc_rl_orp: for more information. Search for all EEG variables within this dataset

Intraclass correlation between right and left Odds Ratio Product (ORP) across all epochs in Total Recording Time (TRT). A high correlation indicates good agreement in sleep depth between right and left hemispheres. The reasons for a low correlation could be: a) reduced range of ORP across TRT (e.g., little stage wake or deep sleep) b) systematic difference between the two electrodes (e.g. noise in one electrode or unilateral brain pathology) c) true dissociation between right and left sleep (Dolphin sleep). :icc_ms_rows:, :icc_ms_col: and :icc_ms_error: distinguish between these three possibilities, respectively. Younes et al. 2021 (PubMed ID: 34156473) Dres et al. 2019 (PubMed ID: 30818966)Azarbarzin et al. 2021 (PubMed ID: 32441843) Search for all EEG variables within this dataset

Arousal intensity on a scale from 1 to 9 (Younes 2017). Search for all EEG variables within this dataset

Used (along with :avg_orp_last120m_nrem:) to calculate :diff_orp:. Search for all EEG variables within this dataset