Figure 3.

Correlation between synovial/serum index (SSI) and mRNA for total IgM and IgG. Correlation plots for SSI versus GAPDH-normalized mRNA levels for total IgM (a) and total IgG (b) in rheumatoid arthritis (RA) and osteoarthritis (OA) synovia. Data are from Figure 2. Correlation coefficients (R) and P values were determined by Spearman rank correlation. GAPDH, glyceraldehyde-3-phosphate dehydrogenase; REU, relative expression units.

Rosengren et al. Arthritis Research & Therapy 2008 10:R105   doi:10.1186/ar2497
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