These are both administrative variables and likely have no analytic value. CFS specimens were analyzed at a laboratory in Vermont, which is why you see Vermont mentioned in some variable labels.
cbal was an identifier generated and used to label specimens before being sent to the lab for testing. vtdna indicates whether the subject has a DNA sample at the lab.
Thanks for using the site!
Thanks for using the site. All the information we have regarding the MNC data collection is present here: https://sleepdata.org/datasets/mnc
Looking at the original CRP variables, my guess would be that the values for these subjects measured below the floor (based on the lab assay). It looks like values of 0.08 (halfway between 0 and the floor of 0.15) were imputed for these subjects, which produces the consistent negative value in the log-transformed version of the variable.
I suggest you decide whether you want to include or exclude subjects below the floor (or above the ceiling) in lab measurements. You might work more closely with the original CRP variables:
Thanks for sharing! I submitted a request for an account and I'll share with the team here.
Hey - thanks for using the site.
I compared these variables:
In glucose_fast_orig I see 5 subjects with values of -999, which presumably was some sort of missing code. I believe the second variable, glucose_fast, is the "clean" version of the fasting glucose, where the 5 negative values have been censored from the dataset. I suggest using glucose_fast in your analyses.
Thanks for checking out the site. I don't think we have any PSG datasets with a SUD focus. Most datasets were geared at assessing subjects for sleep -disordered breathing, hence a heavy focus on sleep apnea.
Thanks for inquiring and using the site. There is some information here:
Looks like EEG = C4 and EEGsec = C3.
I believe these are multiple sleep latency tests (MSLTs).
Check out the "STAGES PSG Upload Form 2020-08-30 Final deidentified.csv" file here https://sleepdata.org/datasets/stages/files/original/De-identified%20Data/CRFs - it has columns indicating the type of PSG(s) performed.
For STNF00199 the file indicates "true" to both diagnostic PSG and MSLT, however it doesn't appear as if we received the diagnostic (overnight) PSG.
I would request you not use the data until it is fixed (out of an abundance of caution).
Today I removed the MAYO PSG data from the site at the behest of the STAGES team; please do so on your end as well. The data contributor recognizes these issues in the EDFs/annotations and hopes to reprocess/fix the MAYO files at a later date.
Thanks again for raising the issue here.