Fig. 1
From: Dancers with non-specific low back pain have less lumbar movement smoothness than healthy dancers
A Power spectral entropy in lumbar extension (the error bars represent one standard deviation); B Dot plot of 3D vector in lumbar extension with optimal cutoff value of 0.5806 marked by a horizontal line (each dot represents each individual entropy value). ***p < 0.001; AP anterior–posterior vector, ML medial–lateral vector, VT vertical vector, 3D root mean square of AP, ML, and VT vectors