Regarding assays, we chose to use Elecsys® assays on a cobas e 601 instrument in the main analysis, since this was the only type of assay with available data for all standard CSF AD biomarkers (Aβ42, Aβ40, P‐tau, and T‐tau) and therefore allowed for a direct comparison of these biomarkers without confounding differences between manufacturers and techniques. Here, MAPT is linked to Alzheimer disease.