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Rates of Seroreversion and Seroconversion when the cut-off values for antibody positivity are selected using different methods.
| Group 1: + /+ | Group 2: + /− | Group 3: −/+ | Group 4: −/− | |
|---|---|---|---|---|
| Minimum Distance between Sensitivity and specificity, using result values | 615 | 49 | 141 | 1306 |
| Using K-means (k = 2) to identify the two clusters of negative and positive samples | 615 | 42 | 143 | 1311 |
| Original (Take average of results points closest to shoulder of ROC curve) | 615 | 42 | 143 | 1311 |
