Question
Question Posted 04/21/25:
Dear experts, I am now learning how to search for files in the ADNI database, and I have found the Definition of DXCHANGE Term in Data Dictionary Search:1. Which best describes the participant's change in cognitive status from last visit to current visit? At Screening Visit, indicate initial diagnosis using one of the 'Stable' options. 2=Stable: MCI; 3=Stable: Dementia; 4=Conversion: NL to MCI; 5=Conversion: MCI to Dementia; 6=Conversion: NL to Dementia; 7=Reversion: MCI to NL; 8=Reversion: Dementia to MCI; 9=Reversion: Dementia to NL and CRF: Diagnostic Summary. I downloaded the Diagnostic Summary, but I can't find DXCHANGE, I wonder if the ADNI database has changed. So I would like to ask if you can provide the location of the DXCHANGE file, and if it is convenient, can you send the file to us, thank you to our experts！
Dear experts, I am now learning how to search for files in the ADNI database, and I have found the Definition of DXCHANGE Term in Data Dictionary Search:1. Which best describes the participant's change in cognitive status from last visit to current visit? At Screening Visit, indicate initial diagnosis using one of the 'Stable' options. 2=Stable: MCI; 3=Stable: Dementia; 4=Conversion: NL to MCI; 5=Conversion: MCI to Dementia; 6=Conversion: NL to Dementia; 7=Reversion: MCI to NL; 8=Reversion: Dementia to MCI; 9=Reversion: Dementia to NL and CRF: Diagnostic Summary. I downloaded the Diagnostic Summary, but I can't find DXCHANGE, I wonder if the ADNI database has changed. So I would like to ask if you can provide the location of the DXCHANGE file, and if it is convenient, can you send the file to us, thank you to our experts！
Response posted 04/21/25 by Danielle:
In an effort to harmonize diagnosis information across the different phases of ADNI, there is now a single diagnosis variable that contains the diagnosis at each visit. Researchers can determine changes in diagnosis on their own based on a different diagnosis at a later visit.
