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Ankle Brachial Index (ABI) is the average ankle to arm systolic pressures as measured from the left and right sides. The higher of the two ankle measures on the same side is divided by the higher of the two systolic arm pressures to derive the right and left side ABI values.

This variable groups left and right ABI into 4 categories.

Brachial blood pressure by Dopler at the overnight PSG

Brachial blood pressure by Dopler at the overnight PSG

Brachial blood pressure by Dopler at the overnight PSG

Brachial blood pressure by Dopler at the overnight PSG

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

Number of left limb movements per hour of sleep

Ankle Brachial Index (ABI) is the average ankle to arm systolic pressures as measured from the left and right sides. The higher of the two ankle measures on the same side is divided by the higher of the two systolic arm pressures to derive the right and left side ABI values. The overall ABI is the mean of those two measurements.

Ankle Brachial Index (ABI) is the average ankle to arm systolic pressures as measured from the left and right sides. The higher of the two ankle measures on the same side is divided by the higher of the two systolic arm pressures to derive the right and left side ABI values.

First readings: Record in order shown (If reading for one leg not available, code as "n__".) e. Left leg posterior tibial systolic blood pressure (BP):

Wait 30 seconds before second readings. Second readings: Record in order shown (If no second reading, code as "n__".) f. Left leg posterior tibial systolic blood pressure (BP):

Number of left limb movements per hour of sleep

Number of hours of usable signal from left eye (EOG) lead as assessed by scorer.

Overall quality of signal from left eye (EOG) lead during sleep as assessed by scorer.