Figure 5
From: Cerebrospinal fluid levels of opioid peptides in fibromyalgia and chronic low back pain
Met-Enkephalin-Arg6-Phe7 (MEAP) concentrations (pg/ml) in cerebrospinal fluid (CSF) from normal (circles), low back pain (LBP, diamonds) and fibromyalgia (FM, triangles) subjects. The bars indicate geometric means and 95% confidence intervals. The groups were significantly different by ANOVA (p = 0.0014). MEAP in the FM (p < 0.01) and LBP (p < 0.05) groups were significantly higher than Normal (2-tailed unpaired Student's t-tests).