Question
Question Posted 04/19/25:
Dear expert, I am currently studying the ADNI database. I found the DXCHANGE code in the Data Dictionary Search, but after downloading the Diagnostic Summary, I couldn't locate DXCHANGE. I would like to ask if you could directly provide us with the file containing DXCHANGE. Thank you, expert.
Dear expert, I am currently studying the ADNI database. I found the DXCHANGE code in the Data Dictionary Search, but after downloading the Diagnostic Summary, I couldn't locate DXCHANGE. I would like to ask if you could directly provide us with the file containing DXCHANGE. Thank you, expert.
Response posted 04/21/25 by Adam D:
The DXCHANGE variable and other historical diagnostic fields were harmonized into the DIAGNOSIS variable, which now applies uniformly across all phases.
