NSRR staff
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The .annot files are now available here: https://sleepdata.org/datasets/nchsdb/files/sleep_data
Thanks for using the site!
1 technician scored each record. If you wish to stratify by scorer, you could use this variables: https://sleepdata.org/datasets/mesa/variables/scorerid5
The team of PSG scorers routinely completed reliability exercises, which are described briefly in this documentation: https://sleepdata.org/datasets/mesa/files/documentation/MESA_Sleep_Data_Documentation_Guide.pdf
Hey Yan --
Unfortunately, there are known issues with the desaturation annotations in SHHS. From this page:
Oxygen desaturation events from the annotation files may be absent and/or may not line up as anticipated with respiratory events. Original scoring data were indelibly changed when converting to a newer version of the scoring software that allowed for the creation of EDF/XML files. Users may opt to derive new desaturation events from the SaO2 signal.
By the way, I know you have posted on the forum in the past about EDF/annotation software you were developing. Is that where your screenshot is from? It looks great! Is the software available for the general public to download/use? Thanks!
Thanks for checking out the site. Here are some insights about ahi_a0h3 that may help:
Hope this helps - let me know if you have follow-up questions!
Hello, thanks for your question!
The dataset documentation contains information on the scoring procedures and available PSG files, e.g.:
SHHS
MESA
WSC
I did some googling and my best guess would be ventricular ectopic (VE) and supraventricular ectopic (SVE). Thanks for checking out the site!
Thanks Sharon - it's a good question and has come up for discussion in the NSRR team before. At present we don't have any plans to extract PSG metrics from the TSV annotations.
The NCH publication (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9296671/pdf/41597_2022_Article_1545.pdf) has this to say:
Sleep studies were annotated in real time by technicians at the time of the study, and then were staged and scored by a second technician afer the study was completed. Technicians annotated studies using a combination of free-form text entries and selections within Natus Sleepworks. Technicians tried to identify all events of interest, however each technician may have their own style of text annotation. Due to the variability in sleep stages in children, NCH does not use automatic scoring of sleep stages. All sleep stages were manually scored by a technician and then verifed or changed by a physician board certifed in sleep medicine. Sleep studies were manually downloaded and converted to EDF+format between May 2019 and Feb. 2020 using Natus Sleepworks version 9. Any gaps in the time-series data were padded with zeros as part of the conversion. Te specifc acquisition equipment, setup, and montage all followed standard care protocol at NCH. While changes may have been made to some studies, the NCH protocol for PSG is in accordance with the rules and technical specifcations recommended by the American Academy of Sleep Medicine10,11. Standard channel names are used and documented in the header of the EDF fles, allowing inference of the montage.
Sleep studies were annotated in real time by technicians at the time of the study, and then were staged and scored by a second technician afer the study was completed. Technicians annotated studies using a combination of free-form text entries and selections within Natus Sleepworks. Technicians tried to identify all events of interest, however each technician may have their own style of text annotation. Due to the variability in sleep stages in children, NCH does not use automatic scoring of sleep stages. All sleep stages were manually scored by a technician and then verifed or changed by a physician board certifed in sleep medicine.
Sleep studies were manually downloaded and converted to EDF+format between May 2019 and Feb. 2020 using Natus Sleepworks version 9. Any gaps in the time-series data were padded with zeros as part of the conversion. Te specifc acquisition equipment, setup, and montage all followed standard care protocol at NCH. While changes may have been made to some studies, the NCH protocol for PSG is in accordance with the rules and technical specifcations recommended by the American Academy of Sleep Medicine10,11. Standard channel names are used and documented in the header of the EDF fles, allowing inference of the montage.
I don't see any other notes/documentation on this end about the scoring rules/guidelines.
The primary NCH publication contains some information on sampling rates: https://pubmed.ncbi.nlm.nih.gov/35853958/
The total length of recording in the NCH Sleep DataBank amounts to 40,884 hours, where the minimum length of study is 3minutes, the maximum is 16.5hours, and the mean is 10.3hours. 94.85% of the fles contain between 8 and 12 hours of recordings, and the patients slept for a subset of those times. Users of the dataset should take into account that the majority of the recordings (3,204) are collected with a sampling frequency of 256Hz, but 581 studies were sampled in 400Hz, and the rest (199) in 512Hz.
Thanks for checking out the site.
The dataset READMEs (e.g., https://sleepdata.org/datasets/shhs) and data request language (e.g., https://sleepdata.org/data/requests/shhs/start) stand-in as a license file, describing appropriate and inappropriate uses of the dataset. Datasets that have commercial use and/or subject type restrictions will state that in the README.
Thanks for visiting the site!
Thanks for the question. There hasn't been a "re-annotation" in the way you're thinking (i.e., re-opening and re-scoring of the PSG data); this is more of a mixing and matching of the originally scored respiratory events to better conform to more modern guidelines.