Figure 1.

Serum ANA levels measured by ELISA in individuals enrolled in DRADR. Results are shown for all individuals, regardless of diagnosis (top panel), for healthy control (HC) subjects only (middle panel) and for SLE patients only (bottom panel). For each set of results, mean and SEM values are shown on the left and individual values are plotted on the right; male and female groups are compared using t-tests. ELISA values greater than 20 units are considered positive.

Li et al. Arthritis Research & Therapy 2011 13:R38   doi:10.1186/ar3271
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