Figure 2. Estimated mean slopes and 95% confidence intervals overlaid on raw individual cognitive scores for participants with CBD (in red) and AD (in blue).

The x-axis represents time (in years) from symptom onset. The y-axis represents the change in cognitive performance (Clinical Dementia Rating [CDR] Sum of Boxes) from symptom onset. p Values represent the group-by-time interaction term. Patients with CBD had faster decline in clinical symptoms, episodic memory, and letter fluency but not in other areas of cognitive performance. AD = Alzheimer disease; CBD = corticobasal degeneration; WAIS = Wechsler Adult Intelligence Scale; WMS-R = Wechsler Memory Scale–Revised.