Figure 2

STN volume differences between the two groups. Blue indicates data for the PD group. Orange indicates data for the healthy control group. EPD = early Parkinson’s disease group. STN = subthalamic nucleus. * = Statistical significance p < 0.05 from a linear mixed model effect. The 25th and 75th percentiles are represented by the lower and upper boundaries of each box with median values represented by the middle band within the box.