NEFL and dementia: In particular, within-group analyses showed that the Aβ42/40 ratio showed a trend of inverse correlation with p-tau217 and NfL only in the dementia group (R= −0.04, (CI: −0.38– −0.38), p = 0.8 for p-tau217 and R= −0.001, (CI: −0.35–0.35), p = 0.99 for NfL).