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Hello, as I'm reviewing the xml files of MNC I noticed some classes that Im not sure how to read.
NREM4: I didn't know it exists and I can't find information on it, can you please elaborate?
8/9: some classes just have a number 8 or 9. Should I treat is as unknown?
I'm guessing some of the MNC cohorts are fairly old and may have been scored in such a way so as to distinguish N3 from N4 sleep in the staging annotations. Generally, N3 and N4 are now collapsed together to represent "slow wave sleep". E.g., https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2635577/
I suggest treating any uncoded epochs (e.g., 8/9) as unknown/unscored.