ADNI MERGE - Diagnosis At Each Visit

[Aqil K H ee20s049]

Hey,

I recently started working with the ADNI data. I was searching for the variable for getting the diagnosis at each visit. I understand  DX has a diagnosis at each visit like CN, Dementia, and MCI. I wanted the change in diagnosis with time within the MCI type. Can you tell me which file contains the diagnosis as EMCI, LMCI, SMC, CN and AD at each visit?

[Dave E]

Hey too - I am just another user, by the way, but my strong understanding is that those five diagnosis categories apply only at baseline. There are only three follow-up diagnosis categories.

So, therefore, there is no file which 'contains the diagnosis as EMCI, LMCI, SMC, CN and AD at each visit'.

A good place to start IMHO, if you haven't already got there, is the ADNIMERGE file. I guess from the various scores available therein you could create your own categories.

No doubt an ADNI admin/mod will be along soon to confirm or otherwise :-)

I hope that is useful,

Dave

[Danielle J Harvey]

Dave is correct – the SMC, EMCI and LMCI categorizations were just used at screening. SMC are still cognitively normal, so from a diagnosis perspective, they are normal. Similarly, EMCI and LMCI are both MCI, so from a diagnostic perspective, we just consider them to be MCI. We used the distinctions at screening so that we could ensure a spread of impairment in the MCI group (SMC were added a bit later in ADNI-2 to capture individuals with memory concerns, but still cognitively normal, since this was becoming a group of interest).

 

Danielle

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