Figure 5: The anti-MCV levels in PsA patients with painful knees are significantly higher than in patients without painful knee. The plots show the antibody in PsA patients without pain of knees (labelled as “No”) and with pain of knees (labelled as “Yes”). The horizontal lines indicate the mean levels of anti-MCVs. *The difference between the anti-MCV levels in the two groups (  U/mL versus  U/mL) was significant ( ).