Fig. 1.

Across the autopsied Alzheimer’s disease cases, the distributions of disease durations were examined by ethnoracial group. The x-axis reflects disease duration from age at onset of cognitive symptoms to the age at death. For each disease duration time on the x-axis, the y-axis was calculated as the proportion of disease durations that were greater than that time. For example, it shows that only 16% of black decedents and 40% of white decedents had a disease duration of 10 years or greater, whereas 66% of Hispanic decedents had a disease duration of 10 years or greater.