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Table 3 Results of KHB/STAT-PAK®/Unigold™ tiebreaker algorithm with dilution as a supplementary test compared to gold standard (N = 495)

From: Dilution testing using rapid diagnostic tests in a HIV diagnostic algorithm: a novel alternative for confirmation testing in resource limited settings

Algorithm

Result

Number

Number with gold standard result

Concordance

Kappa value*

Positive (%)

Negative (%)

1/10

Positive

251

247 (98.4)

4 (1.6)

99.2 %

0.984

Negative

244

0

244 (100)

  

1/40

Positive

248

247 (99.6)

1 (0.4)

99.8 %

0.996

Negative

247

0

247 (100)

  

1/160

Positive

246

246 (100)

0

99.8 %

0.996

Negative

249

1 (0.4)

248 (99.6)

  

1/640

Positive

244

244 (100)

0

99.4 %

0.988

Negative

251

3 (1.2)

248 (98.8)

  

1/2560

Positive

240

240 (100)

0

98.6 %

0.972

Negative

255

7 (2.8)

248 (97.3)

  

1/10,240

Positive

221

221 (100)

0

94.8 %

0.895

Negative

274

26 (9.5)

248 (90.5)

  

TOTAL

495

247 (49.9)

248 (50.1)

  
  1. *All p values for the kappa statistics are <0.001