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Questions about SHHS on sleep AHI data

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JaHyungKoo +0 points · 4 months 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.

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mrueschman +0 points · 4 months 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.

Thanks!

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