TABLE 2.
Sensitivity, specificity, and positive and negative predictive values of SimulFluor DFA and shell vial IP assays in comparison with cell culture for both sexes, individually and in combination
| Subject group (no. of specimens) | Assay | No. of specimens
|
Sensitivity (%) | Specificity (%) | PPVa (%) | NPVa (%) | |||
|---|---|---|---|---|---|---|---|---|---|
| True positive | True negative | False negative | False positive | ||||||
| Males (178) | SimulFluor DFA | 27 | 141 | 5 | 5 | 84.4 | 96.6 | 84.4 | 96.6 |
| Shell vial IP | 29 | 146 | 3 | 0 | 90.6 | 100 | 100 | 97.9 | |
| Culture | 32 | 146 | 0 | 0 | 100 | 100 | 100 | 100 | |
| Females (339) | SimulFluor DFA | 57 | 264 | 16 | 2 | 78.1 | 92.2 | 96.6 | 94.3 |
| Shell vial IP | 63 | 266 | 10 | 0 | 86.3 | 100 | 100 | 96.4 | |
| Culture | 73 | 266 | 0 | 0 | 100 | 100 | 100 | 100 | |
| Males + females (517) | SimulFluor DFA | 84 | 405 | 21 | 7 | 80.0 | 98.3 | 92.3 | 95.1 |
| Shell vial IP | 92 | 412 | 13 | 0 | 87.6 | 100 | 100 | 96.9 | |
| Culture | 105 | 412 | 0 | 0 | 100 | 100 | 100 | 100 | |
a
PPV, positive predictive value; NPV, negative predictive value.