NSRR staff
Boston, MA
0000-0002-0506-8368
Top Topics
Recent Topics
Hey jongguri,
Thanks for diving into the MESA PSG and actigraphy data and posting this question. PSG and actigraphy were scored independent of one another, so some incongruity may be expected when overlapping the two data sources. The PSG and actigraphy devices were meant to be initialized and setup on the same computer such that the internal timekeeping would match.
Everything I see about subject 4892 looks "OK" from my end. I double-checked with the PSG scorer that the time for sleep onset (9:17 p.m.) is set correctly. The device was set to record between 9:00 p.m. and 7:00 a.m. The subject is very still (based on the activity counts) for some time before 9:17 - maybe they were lying in bed before actually trying to fall asleep. We see this a lot, which adds some guesswork to determining where sleep actually begins when reviewing the actigraphy data.
Please let me know if you find any other questionable disagreements when using the overlap file.
Mike
Hi biggull,
You need to have an approved data request to access most datasets.
Click "Request data access" next to the dataset(s) of interest to start the data request process. Thanks!
The meanings are as follows for studies scored in Compumedics:
I have never seen anything like that in SHHS. The parent cohorts (Framingham, ARIC, CHS) undoubtedly have this sort of knowledge about occupation, but it would be a lot of work for a user to go to each cohort and obtain the supplemental data.
Hey,
There was an Occupation questionnaire, from which the current/longest variables were derived. The most granular level of categories are as follows:
Subjects don't appear to ever have been asked to record their occupation (say, in "raw" free text). If you think having the additional categories like the above would be helpful then please let me know here. I could slot those variables to be added in a future release.
Joachim,
Gotcha. Are you looking to see changes in arterial tone and/or blood volume? We don't have any datasets and haven't worked with any PSG/HSAT systems that output the data beyond the Pleth signals you'll find in the datasets we've discussed already.
We are doing a number of WatchPAT (https://www.itamar-medical.com/watchpat-main/) projects, though posting those data are years away since the studies are still active. Here's a screenshot from a test recording, just curious whether this might be getting closer to what you're hoping to find. Unfortunately there wouldn't be any EEG alongside the WatchPAT studies.
https://www.dropbox.com/s/18yqwda5t0e8u0y/watchpat-example.png?dl=1
The MESA EDF files should contain a "Pleth" signal. I saw this signal in the first 3 files I opened, e.g.
Hi weiyuhui,
The review committee typically finishes reviewing data requests within 2-3 weeks of their submission.
I am not aware of any datasets like that available right now (here or elsewhere). We are starting some collaborations with researchers who do in-lab studies related to circadian rhythms. Some of these protocols involve forced desynchrony and varying light exposures. I don't have a firm idea about when any of these data might be posted, but you might want to check back occasionally. Thanks and good luck!
The scoring manuals should describe the scoring procedures for different datasets, e.g.
There isn't a "final diagnosis" per se since the sleep studies for most datasets were conducted for research purposes, so there wasn't an MD interpretation at the end. Users could try computing their own diagnosis variable from the indexes of interest and questionnaire data.