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Table 3 Diagnostic test results compared with former diagnosis (reference test) using 2 by 2 tables

From: Establishing a diagnostic scale of subacute thyroiditis without radioisotope scanning

 

Reference test

 

SAT

No SAT

Test results

SAT

a 167

b 2

a + b = 169

No SAT

c 13

d 127

c + d = 140

  

a + c = 180

b + d = 129

 
  1. a, true positive; b, false positive; c, false negative; d, true negative.
  2. Sensitivity = a/(a + c) × 100% = 92.78%; specificity = d/(b + d) × 100% = 98.45%; positive predictive value = a/(a + b) × 100% = 98. 82%; negative predictive value = d/(c + d) × 100% = 90.71%; False positive rate = b/(b + d) × 100% = 1.55%; false negative rate = c/(a + c) × 100% = 7.22%; accuracy = (a + d)/n × 100% = 95.15%.
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BMC Endocrine Disorders

ISSN: 1472-6823

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