TABLE 7.

Contingency table between anti-HBs in-house assay and the AUSAB RIA with different cutoffsa

Antibody concn cutoff (mIU/ml)Agreement (95% CI)Sensitivity (95% CI)Specificity (95% CI)KappaMcNemar P valueb
297.71 (96.53-98.58)99.02 (98.08-99.58)87.13 (79.00-92.96)0.881 (0.830-0.931)0.3833
2.697.82 (96.66-98.67)98.53 (97.45-99.24)92.08 (84.99-96.52)0.891 (0.843-0.938)0.5034
3.397.61 (96.40-98.49)98.04 (96.84-98.88)94.06 (87.52-97.79)0.883 (0.835-0.931)0.0525
3.996.74 (95.37-97.79)96.94 (95.52-98.01)95.05 (88.82-98.37)0.847 (0.793-0.900)0.0003
  • a n = 919.

  • b Test of dissymmetry in concordance.