I notice some datasets contain lab test results such as C-Reactive protein in CHAT, BestAIR and CFS. Further, CFS dataset have two measurements before and after sleep. I am wondering how about the CHAT and BestAIR? Are they doing those lab tests before or after the sleep?
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!
Thanks a lot for the explaination. It is very helpful. Could you please give me a link about where I can find these information? I was checking the manual https://sleepdata.org/datasets/chat/files/documentation?f=CHAT_Manual_of_Procedures.pdf, about cannot find it.
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.