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Table 3 Kappa statistics and positive and negative samples detected by rapid tests using saliva (3) and whole blood (1) samples compared to results obtained using respective serum samples by enzyme immunoassay ETI-MAK-4®, according to the characteristics of the population under analysis

From: Evaluating HBsAg rapid test performance for different biological samples from low and high infection rate settings & populations

Profile/Manufactory – Biological specimen TP FN TN FP K
Group I
 Vikia HBsAg® - SALIVA 6 76 101 2 5.92 % (0.00–21.8)
 Imuno-Rápido HBsA® - SALIVA 33 49 101 2 40.68 % (26.82–54.54)
 Teste rápido HBsAg®- SALIVA 2 80 101 2 0.55 % (0.00–16.61)
 Vikia HBsAg® - WHOLE BLOOD 18 10 80 0 72.73 % (56.63–88.83)
Group II
 Vikia HBsAg® - SALIVA 0 2 153 5 a
 Imuno-Rápido HBsA® - SALIVA 1 1 155 3 32.2 % (0.00– 97.8)
 Teste rápido HBsAg® - SALIVA 0 2 158 0 a
 Vikia HBsAg® - WHOLE BLOOD 0 3 763 1 a
Group III
 Vikia HBsAg® - SALIVA 0 4 153 0 a
 Imuno-Rápido HBsA® - SALIVA 0 4 149 4 a
 Teste rápido HBsAg® - SALIVA 0 4 150 3 a
 Vikia HBsAg® - WHOLE BLOOD 4 2 387 0 79.75 % (51.76–100.00)
Overall
 Vikia HBsAg® - SALIVA 6 82 407 7 7.72 % (0,00–25,11)
 Imuno-Rápido HBsA® - SALIVA 34 54 405 9 45.65 % (33.1–58.2)
 Teste rápido HBsAg® - SALIVA 2 86 409 5 1.67 % (0.00–19.95)
 Vikia HBsAg® - WHOLE BLOOD 22 15 1230 1 72.72 % (59.44–86.00)
  1. Legend: TP True positive, FN False negative, TN True negative, FP False positive, k kappa statistics, n number of observations (biological samples), CI confidence interval
  2. anot amenable to calculation