(a–p) RMA regression suggested positive linear trends in m.s.e. (y axis) across all walking speeds in 11 out of 16 subjects, and CV (z axis) and speed in 15 out of 16 subjects. However r2 and p-values only strongly support a linear increase in plantar pressure variability with speed in four subjects when assessed by m.s.e., but in 10 subjects when assessed by CV (r2 > 0.75, p = <0.05) (see table 2).