When I merge the GWAS data of ADNI1, ADNI2 and ADNI3, I want to merge the above three data sets into one. I'm looking at the ADNI3 Procedures Manual
Version 3.0, foundFor instructions on how to assign a
new screening participant ID, please refer to the ADNI3 Data Entry Manual. But I can't find the ADNI3 Data Entry Manual(PDF) on the entire ADNI website. I would like to know how to confirm whether a patient has participated in different stages of ADNI multiple times.
The RID (and PTID) are assigned at the time of enrollment and does not change over the course of the entire study. So, a participant enrolled in ADNI-1 will have the same RID (and PTID) in ADNI-GO,2, and 3 (and 4) if they continue on.
You can use the Registry dataset, available in the Enrollment section, to ascertain each participants enrollment across phases.