A novel DNA/histone H4 peptide complex detects autoantibodies in systemic lupus erythematosus sera

Table 2 Analysis of concordance between the different assays for anti-dsDNA detection

	Anti-H4/PK vs Anti-dsDNA	Anti-H4/PK vs CLIF	Anti-dsDNA vs CLIF
Concordance	0.684	0.643	0.611
Cohen K	0.317	0.314	0.289

Cohen K values: 0.21–0.40 indicates modest concordance; 0.41–0.60 indicates moderate concordance; 0.61–0.80 indicates substantial concordance. CLIF Crithidia Luciliae immunofluorescence, H4 histone 4, PK plasmid DNA

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