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TABLE 3

Test Characteristics of a Positive or Equivocal C6 EIA Result for the Diagnosis of Lyme Arthritis

Lyme Arthritis, N = 211Septic Arthritis, N = 11Inflammatory Arthritis, N = 689
Positive or equivocal C6 EIA result 211 39 
Negative C6 EIA result 11 650 
Test performance  
 Sensitivity 211 out of 211 (100%; 95% CI: 98.2%–100%) 
 Specificity 661 out of 700 (94.4%; 95% CI: 92.5%–95.9%) 
 Negative predictive value 661 out of 661 (100%; 95% CI: 99.4%–100%) 
 Positive predictive value 211 out of 250 (84.4%; 95% CI: 79.4%–88.4%) 
 Positive likelihood ratio 17.95 (95% CI: 13.23–24.35) 
Lyme Arthritis, N = 211Septic Arthritis, N = 11Inflammatory Arthritis, N = 689
Positive or equivocal C6 EIA result 211 39 
Negative C6 EIA result 11 650 
Test performance  
 Sensitivity 211 out of 211 (100%; 95% CI: 98.2%–100%) 
 Specificity 661 out of 700 (94.4%; 95% CI: 92.5%–95.9%) 
 Negative predictive value 661 out of 661 (100%; 95% CI: 99.4%–100%) 
 Positive predictive value 211 out of 250 (84.4%; 95% CI: 79.4%–88.4%) 
 Positive likelihood ratio 17.95 (95% CI: 13.23–24.35) 
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