Figure 3.

Number of capillaries (mean ± standard deviation) per millimetre in the nail fold as seen on capillary microscopy. *P < 0.05 in comparison with healthy controls (Co); **P < 0.01 in comparison with Co and with primary fibromyalgia (FM) or rheumatoid arthritis (RA) patients; ***P < 0.001 in comparison with Co.