We use cookies and other tools to enhance your experience on our website and to analyze our web traffic.
For more information about these cookies and the data collected, please refer to our Privacy Policy.

Questions about SHHS on sleep AHI data

7 posts
Was this reply useful? Learn more...
JaHyungKoo +0 points · almost 2 years ago

I research for sleep-apnea using ECG signal.

So I write permitions about using open dataset on NSRR. Therefore, I downloaded SHHS on my research.

I don`t understand on "shhs-data-dictionary-0.18.0-variables.csv" file information. Apnea Hypopnea Index (AHI) has 4-stages below: -None/Minimal: AHI < 5 per hour / -Mild: AHI ≥ 5, but < 15 per hour/ -Moderate: AHI ≥ 15, but < 30 per hour/ -Severe: AHI ≥ 30 per hour And I know how to calculate AHI values.

  1. above are 4-stages different stages from csv files "Central Apnea-Hypopnea Index" and "Obstructive Apnea-Hypopnea Index" ?

  2. is it different, I can select one of 4 condition by the AHI-condition on my research?

  3. "ahiov50" values in "shhs-data-dictionary-0.18.0-variables.csv" files separate from 3 values: 0, 1, and 8 which different 0 and 8. 0 means No, and 8 means Not-applicable. I so understand that No and Not-applicable have equal meaning. is it right?

Also I really appreciated on NSRR answers. I tried to study on SHHS dataset by using all material stuff related to SHHS files.

440 posts
Was this reply useful? Learn more...
mrueschman +0 points · almost 2 years ago

Hey JaHyungKoo - thanks for checking out the site and asking all these questions.

  1. We have many different AHI-like variables. These are mostly continuous metrics (# of events per hour) and it is up to the user to convert them into a categorical breakdown like 0-5, 5-15, 15-30, 30+. One of the most "general" AHI-metrics we have is this harmonized term - https://sleepdata.org/datasets/shhs/variables/nsrr_ahi_hp3r_aasm15

  2. Yes, I suggest you create your own categorical indicator from one of the continuous AHI variables.

  3. Yes, in this instance, "Not applicable" will also mean "No" for ahiov50.


Topic is locked. Start a new topic