MCI participant demographic and baseline data.

See Tables 1 and 3 for key. MCI: mild cognitive impairment. ‡Two MCI participants were not classified for MRI+/− due to technical issues; both had cognitive data and were Aβ+; 1 was ptau−, the other ptau+. *166 (53.4%) of the 311 MCI subjects had CSF Aβ data. All have ptau; includes the two in ‡. $167 (53.7%) of the 311 MCI subjects had CSF ptau data. One of these does not have Aβ data, but has cognitive data and is ptau+MRI+. The 167 include the two in ‡. ∧Only 75 MRI− had CSF Aβ and ptau data; only 89 MRI+ had CSF Aβ data; 90 MRI+ had ptau data.