alpha_intrusion_pct_3sepochs avg_org_trt
Name
avg_normalized_eeg_power
Label
Average Normalized EEG Power
Description

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

Type
numeric
Tags
eeg_shhs
Sleep Heart Health Study (SHHS) Visit Number vs Average Normalized EEG Power
N Mean StdDev Median Min Max Unknown Total
Visit 1 5,535 0.9 ± 0.3 0.8 0.2 3.2 573 6,108
Interim Follow-up Visit - - - - - - - -
Visit 2 - - - - - - - -
CVD Outcomes - - - - - - - -
Gender of the participant vs Average Normalized EEG Power
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 5,535 0.9 ± 0.3 0.8 0.2 3.2 247 5,782
Male 2,648 0.8 ± 0.3 0.7 0.2 2.4 106 2,754
Female 2,887 1.0 ± 0.3 0.9 0.2 3.2 141 3,028
Race of the participant vs Average Normalized EEG Power
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 5,535 0.9 ± 0.3 0.8 0.2 3.2 247 5,782
White 4,685 0.9 ± 0.3 0.8 0.2 3.2 205 4,890
Black 850 0.8 ± 0.3 0.8 0.2 2.4 42 892
Other - - - - - - - -