Hi,
I would like to confirm how the DX variable from the ADNIMERGE CSV file is computed. I am trying to replicate it using the DXCURREN, DXCHANGE and DIAGNOSIS variables in the Diagnostic Summary CSV file, but I do not get the same proportion of patients with dementia. Could you please provide me more information on how the DX variable is derived in ADNIMERGE CSV file?
The DX variable in the ADNIMERGE file is based on the DXCURREN, DXCHANGE, and DIAGNOSIS variables. If you are seeing differences in diagnosis for a given participant between ADNIMERGE and what you get when you look at the DXSUM_PDXCONV_ADNIALL.csv file, it would be helpful if you send specific examples.