Table 1: Correlation between DFS and other IIF patterns and anti-DFS70 antibodies by ELISA and CIA.
Assay
DFS pattern
Other patterns
Positive % agreement*
Negative % agreement*
DFS70 CIA
91/100 (91.0%)
3/100 (3.0%)
91.0% (83.6–95.8%)
97.0% (91.5–99.4%)
ANA ELISA
35/100 (35.0%)
67/100 (67.0%)
67.0% (56.9–76.1%)
65.0% (54.8–74.3%)
*Positive and negative percent agreements were calculated based on the target cohort: For DFS70 CIA the target cohort is the group of samples with DFS pattern and the control cohort is the group of samples with other ANA patterns; for ANA ELISA the target cohort is the group of samples with other ANA patterns and the control cohort is the group of samples with DFS patterns.