Table 2.

Performance of the four autoantibodies in differentiating SLE patients from SS patients when specificity is set to 95%.

Antibody	Cut Off	Sensitivity		Specificity
Anti-dsDNA	100	52.78%		90.80%
Anti-Nucl	20	44.91%		90.80%
Anti-Rib P	20	17.59%		97.70%
Anti-C1q	20	15.28%		98.85%
Specificity of assays is defined at 95%
Anti-dsDNA	188	41.20%		95.40%
Anti-Nucl	58	32.87%		95.40%
Anti-Rib P	20	17.59%		97.70%
Anti-C1q	20	15.28%		98.85%

Anti-dsDNA: anti-double-stranded DNA antibodies; Anti-Nucl: anti-nucleosome antibodies; Anti-Rib P: anti-ribosomal P antibodies; Anti-C1q: anti-c1q antibodies