Fig. 2
From: Dancers with non-specific low back pain have less lumbar movement smoothness than healthy dancers
A Power spectral entropy in lumbar flexion (the error bars represent standard deviation); B Dot plot of 3D vector in lumbar flexion with optimal cut-off value of 0.5649 marked by a horizontal line (each dot represents each individual entropy value). **p < 0.01, AP anterior–posterior vector, ML medial–lateral vector, VT vertical vector, 3D root mean square of AP, ML, and VT vectors