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I believe the values correspond to 0 = ON and 1 = OFF.
Here's a snippet from the manual:
The Profusion XML files also have a section near the beginning that lists the LIGHT meanings, which typically go in numeric order (0, 1).
https://sleepdata.org/datasets/shhs/pages/08-equipment-shhs1.md - there's some more information here. I don't think the channel was intended to be used outside of the beginning and end of the sleep period in the setting of lights off/on. I did inquire with a sleep scorer to see if those coded values have specific meanings when represented in Compumedics. I'll let you know if I hear anything back.
Thanks for checking out the site!
Once approved you will have access to the EDFs, annotations, and covariate/phenotype variable files.
Yes, I believe for both STAGES and WSC the goal was to collect the PSG and depression data around the same time.
We look forward to reviewing your data request. Thanks!
Thanks for using the site. You can read more about the SHHS annotations here - https://sleepdata.org/datasets/shhs/pages/05-polysomnography-introduction.md
We generally do not post EDF+ files (with an embedded annotations channel), instead we keep staging and event scoring annotations in separate files (for SHHS, two XML formats).
https://sleepdata.org/datasets/shhs/files/polysomnography/annotations-events-profusion https://sleepdata.org/datasets/shhs/files/polysomnography/annotations-events-nsrr
(Moving things down so they don't get so nested)
Yes, I agree the blank cells are likely some quirk then of opening the XML in Excel. You can open the XML in a text editor and the beginning of the SleepStages element should look like what I posted above.
I pinged the creator of this Luna vignette with your question - https://zzz.bwh.harvard.edu/luna/vignettes/rcox/ (in the vignette the Status column is ignored)
Can you clarify what you mean by "several blank cells" and provide example filenames for me to look at? I opened mesa-sleep-0085-profusion.xml and see this at the beginning of the <SleepStages> section, which corresponds to the first 3 epochs of the recording being scored as wake.
<SleepStages><SleepStage>0</SleepStage><SleepStage>0</SleepStage><SleepStage>0</SleepStage>
Note the reference for the Profusion XML stage coding can be found here: https://github.com/nsrr/edf-editor-translator/wiki/Compumedics-Annotation-Format
Sleep stages: hypnogram is broken into periods of 30 seconds (epoch). 0 is wake stage, 1-4: sleep stage 1-4 and 5 is REM sleep. 9 is Active.
The total recording time (TRT) for PSG is available: https://sleepdata.org/datasets/mesa/variables/stdurm5 (column is present in 'mesa-sleep-dataset' CSV file here: https://sleepdata.org/datasets/mesa/files/datasets)
Yes, the PSG was only one night and it was intended to overlap with the first night of actigraphy.
The XML sleep staging section begins at the PSG recording start time (starttime_psg). Most PSG files will have varying periods of wake before the first epoch of scored sleep (N1/N2/N3/REM). As part of this "overlapping" process you should include all epochs from the XML file (though you may only ultimately concern yourself with staged NREM/REM sleep).
Please submit a data request to obtain access to the STAGES datasets and PSG files. The file are restricted to approved users. You can start a data request here: https://sleepdata.org/data/requests/stages/start
Thanks for using the NSRR!
I suggest reading more in the literature about the device used in MESA, the Actiwatch Spectrum. I did find this link, https://www.labfront.com/article/comparing-motionlogger-with-actiwatch-2, which suggests the Philips Actiwatch-2 (a precursor to the Spectrum) used proportional-integrating mode (PIM).
The Philips devices output the data in a single format, so to my knowledge it's not possible to go back and re-output/re-derive the watch data using other methods (e.g., ZCM).
Thanks for using the site!