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. 2001 Sep;8(5):909–912. doi: 10.1128/CDLI.8.5.909-912.2001

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. 

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