Table 2.
Accuracy of results from rapid antibody tests regarding concordance with quantitative antibody test results.
| ALLTest | SD BIOSENSOR | KURABO | ||||
|---|---|---|---|---|---|---|
| (n = 69) | (n = 55) | (n = 34) | ||||
| IgG antibody | ||||||
| Concordance rate (%) | 76.8 | k = 0.55 | 96.4 | k = 0.93 | 88.2 | k = 0.72 |
| Sensitivity (%) | 67.4 | χ2 = 23.38 | 96.7 | χ2 = 47.23 | 72.7 | χ2 = 17.88 |
| Specificity (%) | 92.3 | P < 0.01 | 96 | P < 0.01 | 95.7 | P < 0.01 |
| Positive predictive value (%) | 93.5 | 96.7 | 88.9 | |||
| Negative predictive value (%) | 64.2 | 96 | 88 | |||
| Threshold IgG titre (AU/mL) | 19.1 | 19.1 | 19.1 | |||
| Test positive rate over IgG threshold titre | 69 | 100 | 100 | |||
| IgM antibody | ||||||
| Concordance rate (%) | 55.1 | k = 0.07 | 88.7 | k = 0.76 | 91.2 | k = 0.62 |
| Sensitivity (%) | 15.2 | χ2 = 0.78 | 85 | χ2 = 31.34 | 75 | χ2 = 13.14 |
| Specificity (%) | 91.7 | P = 0.47 | 90.9 | P < 0.01 | 93.3 | P < 0.01 |
| Positive predictive value (%) | 62.5 | 85 | 60 | |||
| Negative predictive value (%) | 54.1 | 90.9 | 96.6 | |||
| Threshold IgM titre (AU/mL) | 13.8 | 12.2 | 12.2 | |||
| Test positive rate over threshold titre | 17.9 | 89.5 | 75 | |||