No, we do not recommend combining OASIS-1, OASIS-2, or OASIS-3. However, OASIS-4 is a unique dataset that can be combined with any of the other datasets. For class projects we recommend using OASIS-1 or OASIS-2. For all other research questions please review the data summary to select the best dataset.
This is a longitudinal study that had various visit intervals and these visits are represented in the datatype label (visit = days from entry = d#### (ex. MR_d1234)). You will have to determine your own criterion for matching clinical visit to imaging visit (ex: +- 6months or only -6months).
This R script can be used to match visits by “days from entry”: https://github.com/NrgXnat/oasis-scripts#matching-up-session-data-by-days-from-entry
All diagnostics, assessments, and json information are provided in csv documents under ‘OASIS3_data_files’ and ‘OASIS4_data_files’
This document will help you navigate OASIS on XNAT.
OASIS-4 CSF assays should not be combined with assays measured with Elecsys or Lumipulse assay methods. See data dictionary for more information.
Each subject and data session receives a unique XNAT accession/ID number. For downloaded imaging sessions this can be found in the dataset_description.json file.
Ex. of Subject ID/Accession#: CENTRAL_S05094
We also recommend using these IDs for supplementary information when referencing data used in publications and tools.
No. All available data is included in the released datasets.
Details can be found here: https://sites.wustl.edu/oasisbrains/home/oasis-3/navigate-oasis-in-nitrc-ir/