Figure 1.

Double-limb support duration (as a percentage of gait cycle duration) shown as a function of task. Mean double-limb support duration was significantly longer in the 1-back and speech dual-task conditions, relative to single walk. The upper and lower margins of the box indicate the interquartile range. The horizontal line through the box indicates the median and the solid diamond represents the mean. The error bars indicate the range of values, with dots representing outliers (>1.5 times the interquartile range)