Figure 4From: Cerebrospinal fluid levels of opioid peptides in fibromyalgia and chronic low back painTender points. The numbers of tender points detected by dolorimetry with ≤ 4 kg/cm2 pressure were higher for FM (triangles, n = 14), than LBP (squares, n = 9, p = 0.03) and Normal (circles, n = 6, p = 0.008) groups. The bars indicated means and 95%CI's.Back to article page