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.
above are 4-stages different stages from csv files "Central Apnea-Hypopnea Index" and "Obstructive Apnea-Hypopnea Index" ?
is it different, I can select one of 4 condition by the AHI-condition on my research?
"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.
Hey JaHyungKoo - thanks for checking out the site and asking all these questions.
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
Yes, I suggest you create your own categorical indicator from one of the continuous AHI variables.
Yes, in this instance, "Not applicable" will also mean "No" for ahiov50.