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Correct, a days to AF since baseline variable does not exist in SHHS.
Thanks for using the NSRR!
For your first question, these variables are where I would start:
The Interim Follow-up was a distinct visit. No home sleep test; the visit consisted of a couple sleep-related forms, weight/BP measurements (if there was an in-clinic portion), and questions about cardiovascular events since Visit 1.
Hey Snowman,
I heard back from WSC today - they have log files that provide information about lights out/on for each of the naps. I think these will provide the "precise indices" you need to segment the data as you discussed.
The WSC team offered to prepare these log files for the MSLTs posted on the site, however it will take them some time (at least a few months) to fit it into their schedule. I will post here again when I have further updates.
Thanks for using the site. I pinged the WSC team for more information.
I have not checked every SHHS file myself to know whether your conclsuion is sound. I still think it would be advisable to run some systematic check across all the XML files to make sure the position codes are in the same order.
Thanks for your thoughtful question!
The WSC team let me know that they do not have plans to share medication lists for each WSC subject. They did highlight that the Manual of Procedures (https://sleepdata.org/datasets/wsc/files/documentation/WSCS_Manual_of_Operations.pdf - pages 41-46) specifies the drug groupings that went into variables such as sedative_med.
Thanks for using the site. The position values may differ between SHHS subjects, so you should reference the individual Profusion XML files.
If you open a Profusion XML file, you'll find the Position Input definitions near the top, e.g.
The labels here correspond to the order of the position signal values, so
0 - Right
1 - Left
2 - Back
3 - Front
I reached out to the WSC team and will respond here when I receive a response. Thanks for using the site!
I would read the primary publications for the datasets, which may describe the general timeframe for different measurements. Some datasets will contain specific variables for "time between X (e.g., randomization) and Y (specific measurement)". The datasets may not wholly describe the sort of nuance you've hit upon.
The sleep studies in CHAT and BestAIR were done at different timepoints than the clinic visits that included the blood draws.
The CHAT/BestAIR baseline/screening sleep studies would often be conducted weeks before the blood draw at the baseline/randomization visit. The follow-up sleep studies may have been conducted close in time to the blood draws, though not always.
The CFS protocol was special in the way that measurements took place before and after the scheduled in-lab sleep study.
Thanks for checking out the site!