Figure 3From: Cerebrospinal fluid levels of opioid peptides in fibromyalgia and chronic low back painPressure pain thresholds (kg/cm2) determined by dolorimetry. Pain thresholds for FM (triangles) were significantly lower than LBP (squares; p = 0.009) and Normal (circles; p = 0.002) groups. The bars indicated means and 95% confidence intervals.Back to article page