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Results of duplicate testing of fecal samples from cross-sectional farm survey for cattle shedding E. coli O157a
| Test 1 result | No. of samples with test 2 result of:
|
Total | |
|---|---|---|---|
| + | − | ||
| + | 19 | 8 | 27 |
| − | 4 | 511 | 515 |
| Total | 23 | 519 | 542 |
Paired exact test, P = 0.39; kappa statistic, 0.75; Pneg, 0.99; Ppos, 0.76.
