Question
Question Posted 09/23/25:
Hi! I'm trying to merge a lot of ADNI tables. I was wondering if I can do it with either PTID or RID. I don't understand the difference between them.
Also, I've got the same question for ADNIDOD dataset (just that here we have ID and RID). I'm not sure of what ID to use. Thank you!
Hi! I'm trying to merge a lot of ADNI tables. I was wondering if I can do it with either PTID or RID. I don't understand the difference between them.
Also, I've got the same question for ADNIDOD dataset (just that here we have ID and RID). I'm not sure of what ID to use. Thank you!
Response posted 09/23/25 by Danielle:
PTID or RID will work for merging (RID is just the last set of digits following the _S_ in PTID). In ADNI-DOD, use SCRNO as the unique participant identifier.
