TABLE 1.
Performance of Premier E. coli O157 test in the field and in resolved results after repeat testinga
| Category | Result [no. of specimens with correct result/ total no. of specimens (%)]
|
|||
|---|---|---|---|---|
| Sensitivity | Specificity | PPV | NPV | |
| Field | 57/66 (86) | 798/811 (98) | 57/70 (81) | 798/807 (99) |
| Resolved | 60/68 (88) | 806/809 (99) | 60/63 (95) | 806/814 (99) |
a
Sensitivity = (number of true positives/number of true positives + number of false negatives) × 100; specificity = (number of true negatives/number of true negatives + number of false positives) × 100; positive predictive value (PPV) = (number of true positives/number of true positives + number of false positives) × 100; negative predictive value (NPV) = (number of true negatives/number of true negatives + number of false negatives) × 100.