Hmm, I still don't fully understand. These were research subjects, so there won't be any sort of subjective "interpretation" (by a medical professional).
The polysomnologist who scored the study gave ratings of the quality of individual signals and the overall quality of the sleep study, e.g. https://sleepdata.org/datasets/shhs/variables?folder=Measurements%2FPolysomnography%2FSignal+Quality
Sleep efficiency (https://sleepdata.org/datasets/shhs/variables/slp_eff) is a commonly used metric to assess the "quality" of a person's sleep. This is the proportion of time spent asleep within the time in bed. Higher efficiency is thought to often indicate a "better" night's sleep.
I'll take a look and get back to you sometime next week.
Were you thinking of self-reported sleep quality? Maybe these variables from the Morning Survey in SHHS2 would help: https://sleepdata.org/datasets/shhs/variables?folder=Questionnaires%2FSHHS2%2FMorning+Survey
If you had another sort of quality in mind let me know and I can comment again.
You are correct, each PSG in SHHS2 comes from a different patient. There are 2,651 EDFs in this folder (https://sleepdata.org/datasets/shhs/files/polysomnography/edfs/shhs2) and they come from 2,651 different individual research subjects.
Thanks for checking out the site!
A commonly used AHI variable in SHHS is: https://sleepdata.org/datasets/shhs/variables/ahi_a0h4
If you are using the XML files then you can add up the number of "Apnea" and "Hypopnea" events to compute your own indices.
Thanks for your interest in the resource. To access data files you need an approved data request. Please click Request Data Access next to the dataset of interest from the datasets index. Most data requests are reviewed and receive a response within 1-2 weeks of submission.
Note: HAASSA has additional access requirements, so I might suggest starting with a different dataset (e.g. SHHS, MESA).
Thanks for your interest in the resource. Have a look around some of our datasets, particularly the montage/sampling pages, e.g. CFS, MESA, etc. Many of the datasets will have plethysmography and ECG, though the participant populations vary in their levels of healthiness. You may supplement your analysis with other variables (e.g. medical history) to decide which participants to include.
Hey - sorry about that. HCHS used a sleep monitor with limited capabilities. I see your new data request came through, hopefully you'll hear about that one soon. Thanks for using the site!
The "Polysomnography introduction" pages (e.g. https://sleepdata.org/datasets/shhs/pages/05-polysomnography-introduction.md) have links that describe the XML files.
Thanks for the inquiry. I will email a dataset to you with the start month of each subject's actigraphy recording.