Supplementary Figure 1. Individual anterior-posterior drift and diffusion plots for the

children with balance problems (A) and the typically developing control children (B) while

standing with vision. The top panel for each child is the drift plot, and the bottom panel is

the diffusion plot. The coefficient of determination for the lines fit to the drift plots were

0.98 + 0.003 for the children with balance problems and 0.97 + 0.017 for the typically

developing control children. The coefficient of determination for the lines fit to the

diffusion plots were 0.98 + 0.003 for the children with balance problems and 0.98 + 0.003

for the typically developing control children.

Supplementary Figure 2. Individual anterior-posterior drift and diffusion plots for the

children with balance problems (A) and the control children (B) while standing with no

vision. The top panel for each child is the drift plot, and the bottom panel is the diffusion

plot. The coefficient of determination for the lines fit to the drift plots were 0.96 + 0.013 for

the children with balance problems and 0.99 + 0.003 for the typically developing control

children. The coefficient of determination for the lines fit to the diffusion plots were 0.98 +

0.006 for the children with balance problems and 0.99 + 0.003 for the typically developing

control children.

Supplementary Figure 3. Individual medial-lateral drift and diffusion plots for the children

with balance problems (A) and the control children (B) while standing with vision. The top

panel for each child is the drift plot, and the bottom panel is the diffusion plot. The

coefficient of determination for the lines fit to the drift plots were 0.97 + 0.01 for the

children with balance problems and 0.98 + 0.006 for the typically developing control

children. The coefficient of determination for the lines fit to the diffusion plots were 0.98 +

0.006 for the children with balance problems and 0.98 + 0.006 for the typically developing

control children.

Supplementary Figure 4. Individual medial-lateral drift and diffusion plots for the children

with balance problems (A) and the control children (B) while standing with no vision. The

top panel for each child is the drift plot, and the bottom panel is the diffusion plot. The

coefficient of determination for the lines fit to the drift plots were 0.98 + 0.003 for the

children with balance problems and 0.98 + 0.003 for the typically developing control

children. The coefficient of determination for the lines fit to the diffusion plots were 0.98 +

0.003 for the children with balance problems and 0.99 + 0.003 for the typically developing

control children.