Figure 1. Swim Plot of Follow-up by Calendar Year.

Each individual is represented by a horizontal segment in this plot, colored, and arranged by diagnosis group. The calendar date of the first visit is the dark square in each segment. Left of the dark point represents the time from onset to first visit, and right of the point represents follow-up from the first visit, thus the total length of the line is used in the time-to-event analyses. An × at the end of a segment indicates that the patient has died, and a • indicates a censor (i.e., the last known date a patient was alive). AOS = apraxia of speech; PAA = progressive agrammatic aphasia; PPAOS = primary progressive AOS.