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Sensitivity, specificity, and predictive values of the three assays for diagnosis of CDIa
| Test | No. of samples with indicated result |
Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | |||
|---|---|---|---|---|---|---|---|---|
| S+ T+ | S+ T− | S− T+ | S− T− | |||||
| RTCA | 28 | 4 | 1 | 267 | 87.5 | 99.6 | 96.6 | 98.5 |
| EIA | 18 | 14 | 1 | 267 | 56.3 | 99.6 | 94.7 | 95.0 |
| PCR | 32 | 0 | 10 | 258 | 100.0 | 96.3 | 76.2 | 100.0 |
S, standard; T, test; +, positive; −, negative; PPV, positive predictive value; NPV, negative predictive value.
