I am also working on this dataset and I am wondering if you found more info about the columns. I am wondering if there is a publication or whitepaper for this dataset where all this can be clarified/confirmed?
Thank you very much @mrueschman for your reply. I am downloading and exploring more the dataset. Thank you for the pointers. I will contribute to the thread about the variables as I keep discovering more.
I am wondering if there is an alternative way to download the dataset without Ruby? I saw an option to do it with R (https://www.sleepdata.org/blog/2019/03/download-from-the-nsrr-directly-through-r) but I am not familiar with R at all.
Another question regarding the dataset is what is/are variables that directly measure obstructive apnea events?
Many thanks for your help!