Figure 1
Person-specific paths of progressive parkinsonism. The figure is organized according to the age of the participant at each evaluation; the length of each line relative to the x-axis indicates the total years of observation for that individual. The figure is estimated for a 25% random sample of the cohort and shows smoothed person-specific paths estimated from a random-effects model which included a term for time and controlled for age, sex, education and their interaction with time. The left Y axis shows the square root of global parkinsonian scores and the right Y axis shows the untransformed global parkinsonian scores.