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 |
PPV, positive predictive value; NPV, negative predictive value.