Cutoffb
| Sensitivity % | Specificity % | Positive LR | Negative LR | % to be tested |
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≥ 0.9 | 85.4 | 53.0 | 1.8 | 0.3 | 47.2 |
≥ 1.1 | 67.2 | 72.3 | 2.4 | 0.5 | 27.9 |
≥ 1.5 | 56.2 | 88.8 | 5.0 | 0.5 | 11.4 |
≥ 1.6 | 51.8 | 89.9 | 5.1 | 0.5 | 10.3 |
≥ 1.7 | 48.9 | 90.7 | 5.3 | 0.6 | 9.5 |
≥ 1.8 | 48.9 | 90.9 | 5.4 | 0.6 | 9.3 |
≥ 2.0 | 48.8 | 91.1 | 5.4 | 0.6 | 9.1 |
≥ 2.4 | 28.5 | 97.1 | 9.8 | 0.7 | 3.0 |
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LR likelihood ratio, MACS Multicenter AIDS Cohort Study
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aIncluding 4 symptoms and 3 risk factors (Table 3, row 7): fever, lymphadenopathy, oral thrush, weight loss, gonorrhea, receptive condomless anal intercourse, >5 sexual partners
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bCutoff levels were defined by each possible sum of the score of symptoms and risk factors, based on the beta coefficient (Table 3, column 8)