Histogram

Acceptable EEG signal quality during sleep vs Visit
Visit 1 Visit 2
Total 2,911 2,911
< 25% of sleep time 16 13
25 - 49% of sleep 33 15
50 - 74% of sleep 120 52
75 - 94% of sleep 587 155
> 95% of sleep time 2,155 791
Unknown - 1,885
Acceptable EEG signal quality during sleep vs Age at Sleep Visit 1
Visit 1
67.0 to 72.0 years 72.0 to 76.0 years 76.0 to 80.0 years 80.0 to 90.0 years Total
Total 728 728 728 727 2,911
< 25% of sleep time 5 2 5 4 16
25 - 49% of sleep 6 7 10 10 33
50 - 74% of sleep 34 22 30 34 120
75 - 94% of sleep 145 136 141 165 587
> 95% of sleep time 538 561 542 514 2,155
Acceptable EEG signal quality during sleep vs Gender
Visit 1
Female Male Total
Total - 2,911 2,911
< 25% of sleep time - 16 16
25 - 49% of sleep - 33 33
50 - 74% of sleep - 120 120
75 - 94% of sleep - 587 587
> 95% of sleep time - 2,155 2,155
Acceptable EEG signal quality during sleep vs Gender
Visit 2
Female Male Total
Total - 2,911 2,911
< 25% of sleep time - 13 13
25 - 49% of sleep - 15 15
50 - 74% of sleep - 52 52
75 - 94% of sleep - 155 155
> 95% of sleep time - 791 791
Unknown - 1,885 1,885
Acceptable EEG signal quality during sleep vs Race Category
Visit 1
White African American Asian Native Hawaiian or Other Pacific Islander American Indian or Alaskan Native Multiracial Unknown Total
Total 2,651 99 85 3 1 30 42 2,911
< 25% of sleep time 12 3 1 - - - - 16
25 - 49% of sleep 32 - 1 - - - - 33
50 - 74% of sleep 109 9 1 - - - 1 120
75 - 94% of sleep 525 32 14 1 1 4 10 587
> 95% of sleep time 1,973 55 68 2 - 26 31 2,155
Acceptable EEG signal quality during sleep vs Race Category
Visit 2
White African American Asian Native Hawaiian or Other Pacific Islander American Indian or Alaskan Native Multiracial Unknown Total
Total 2,651 99 85 3 1 30 42 2,911
< 25% of sleep time 12 - 1 - - - - 13
25 - 49% of sleep 10 3 1 - - 1 - 15
50 - 74% of sleep 44 5 2 - - - 1 52
75 - 94% of sleep 132 4 8 3 - 4 4 155
> 95% of sleep time 698 29 37 - 1 9 17 791
Unknown 1,755 58 36 - - 16 20 1,885