Colored bars represent the mean number of errors in the (A) incidental recall, (B) delayed recall, and (C) recognition conditions of the Three Words Three Shapes test for the 3 diagnostic groups. Brackets indicate significant pairwise differences. Error bars indicate 1 SD; error bars are absent for groups that had perfect (ie, error-free) performances. AD indicates autopsy diagnosis of Alzheimer disease neuropathology; AMN, clinical diagnosis of amnestic dementia; FTLD, autopsy diagnosis of frontotemporal lobar degeneration; PPA, clinical diagnosis of primary progressive aphasia.
a Significant difference across the 3 groups (P = .001).
b Significant within-group difference (P < .025).