Question
Question Posted 02/15/18:
What is meaning of baseline diagnosis? What is the difference between VISCODE and VISCODE2?
What is meaning of baseline diagnosis? What is the difference between VISCODE and VISCODE2?
Response posted 02/15/18 by Danielle:
The baseline diagnosis is the diagnosis at the baseline visit. Individuals are identified as normal, MCI or demented.
VISCODE is the code used for a particular visit. In ADNI1, this was easy to interpret as the codes corresponded to a particular month visit. In ADNIGO/2, this changed, so that the VISCODE was no longer easily interpreted. VISCODE2 translates the VISCODEs into a corresponding month visit for each individual.
VISCODE is the code used for a particular visit. In ADNI1, this was easy to interpret as the codes corresponded to a particular month visit. In ADNIGO/2, this changed, so that the VISCODE was no longer easily interpreted. VISCODE2 translates the VISCODEs into a corresponding month visit for each individual.
Response posted 02/15/18 by Vandana:
Thank you for answer.
I have following question,
How do I know the 819 individuals enrolled in ADNI1 belong to NC / MCI / Ad?
I have following question,
How do I know the 819 individuals enrolled in ADNI1 belong to NC / MCI / Ad?
Response posted 02/15/18 by Danielle:
The easiest place to find this information is in the ADNIMERGE file (Key tables merged together - available on the study data page). There is a variable for baseline diagnosis. You can use RID< 2000 to identify ADNI-1 participants. Alternatively, you can find the diagnosis information in the Diagnostic Summary file - for ADNI-1, use DXCURREN and VISCODE=="bl" to get the baseline diagnosis (refer to the data dictionary, also available for download on the same page for coding information).
