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Laboratories reporting one or more incorrect results.
| Year | Total Number of PT Participants | Number of Laboratories Reporting One Negative Result | Number of Laboratories Reporting Two Negative Results | Number of Laboratories Reporting Three Negative Results | |||
|---|---|---|---|---|---|---|---|
| 2015 | 394 | 55 | 14% | 14 | 4% | 1 | 0.3% |
| 2016 | 374 | 64 | 17% | 12 | 3% | 1 | 0.3% |
| 2017 | 385 | 33 | 9% | 20 | 5% | 1 | 0.3% |
| 2018 | 365 | 57 | 16% | 8 | 2% | 0 | 0.0% |
| 2019 | 378 | 48 | 13% | 12 | 3% | 0 | 0.0% |
