Table 2.
Probability of observing each combination of diagnostic test results given the true epidemiological status as uninfected or infected.
| Combination of test results | Test 1 (StatPak) | Test 2 (inter-feron-gamma assay) | Test 3 (Culture) | Probability of the combination of test results | |||
|---|---|---|---|---|---|---|---|
| If uninfected | If infected | ||||||
| point estimate | 95% CI | point estimate | 95% CI | ||||
| 1 | − | − | − | 0.94 | 0.91, 0.96 | 0.27 | 0.22, 0.33 |
| 2 | + | − | − | 0.02 | 0.01, 0.03 | 0.27 | 0.23, 0.31 |
| 3 | − | + | − | 0.04 | 0.03, 0.06 | 0.16 | 0.13, 0.20 |
| 4 | − | − | + | <0.01 | − | <0.01 | − |
| 5 | + | + | − | <0.01 | − | 0.23 | 0.20, 0.27 |
| 6 | + | − | + | <0.01 | − | 0.01 | 0.00, 0.02 |
| 7 | − | + | + | <0.01 | − | <0.01 | − |
| 8 | + | + | + | <0.01 | − | 0.05 | 0.04, 0.06 |
CI = confidence interval; + = positive test result; −= negative test result.