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Figure 1 .

Figure 1

Consecutively collected ANA positive sera were examined for anti-DNA antibodies by different solid phase assays. Correlations are shown for anti-ssDNA and anti-dsDNA as detected by solid phase ELISA (rs = 0.4, p = 0.002) (A); anti-dsDNA antibodies detected in dsDNA ELISA versus CLIFT (rs = 0.11, p = 0.4) (B); dsDNA ELISA versus EliA dsDNA assay (rs = 0.55, p = 0.001) (C); and CLIFT versus EliA dsDNA assays (rs = 0.58, p<0.0001) (D). Inserted in each figure (A–D) are 2x2 tables showing the number of patients. The cut off values are 55 (U), 20 (U), and 10 (titre), for ELISA ssDNA/dsDNA, EliA dsDNA and CLIFT, respectively.