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Table 1 Intra- and inter-laboratory agreement of the NAb testing in terms of NAb positive versus NAb negative status

From: Variability in detection and quantification of interferon β-1b–induced neutralizing antibodies

Laboratory

A(I)

B

C

D

A(II)

0.86

0.87

0.68

0.63

B

  

0.65

0.60

C

   

0.57

  1. Kappa values are shown for the individual laboratory comparisons. A (I): original analysis in Laboratory A (MxA induction assay); A(II) re-analysis of samples in Laboratory A (MxA induction assay); B, Laboratory B (CPE assay); C, Laboratory C (CPE assay); D, Laboratory D (luciferase assay).