Fig. 1

Box plots used to compare Young’ s modulus of the lumbar multifidus muscle on the left and right sides in patients and controls. Numbers are YM in kPa. The left and right LM muscles of the two groups were compared separately (left = blue, right = red). The ends of the boxes represent the upper and lower quartiles, and the line separating the two areas indicates the median. Vertical lines indicate the full ranges of values in the data