Figure 1: Sway index scores for healthy older adults and individuals with Parkinson’s disease. A. Healthy older adults showed increases in sway with eyes closed and when standing on a soft surface. The greatest change in sway score occurred between EOFS and ECSS. B. Individuals with Parkinson’s disease showed similar changes in sway scores as healthy older adults. However, these subjects showed higher sway than the healthy group in the eyes closed and soft surface conditions. *= p<0.001