Fig. 2

Incidence of dementia in Parkinson’s disease (PD) over time. The X-axis represents the quarter (Q) and year, and the Y-axis represents the number of people. The slope of the first year was the steepest, and decreased every year thereafter. Approximately 25% of patients were diagnosed with dementia within the first year; approximately 60% of patients were diagnosed within the first 3 years, and more than 80% of patients were diagnosed within the first 5 years. The higher the age group, the more rapid the diagnosis of dementia