Figure 1

Boxplot of minimum obstacle distance by subject group and floor surface. Minimum distances between any point on the shoe and any of 64 small obstacles on the floor during each footfall was significantly greater for older subjects (p<0.0001) and on the visible obstacle floor (p<0.0001) primarily due to older women and some older men actively avoiding visible obstacles. Dots indicate values between 1.5 and 3*interquartile range and stars indicate values >3*interquartile range.