Table 3.
Association between CT value and clinical factors
| Variable | Beta | SE | P |
|---|---|---|---|
|
| |||
| Vaccination status | |||
| Unvaccinated | Ref | — | — |
| Vaccinated | −0.70 | 0.26 | 0.01 |
| Lineage | |||
| Alpha | Ref | — | — |
| Delta | −0.23 | 0.87 | 0.79 |
| Omicron | 1.68 | 0.92 | 0.07 |
| Symptom Duration at Time of Testing | |||
| Asymptomatic | Ref | — | — |
| 0–3 days | −2.99 | 0.55 | <0.001 |
| 4–7 days | −1.62 | 0.61 | 0.01 |
| 8+ days | 0.20 | 0.68 | 0.77 |
| Assay | |||
| Cepheid Gene Xpert | Ref | — | — |
| BioFire Defense, LLC - BioFire COVID-19 Test | −1.78 | 2.82 | 0.54 |
| Cepheid - Xpert Xpress SARS-CoV-2/Flu/RSV | −0.39 | 2.85 | 0.89 |
| Roche Cobas | −0.56 | 0.35 | 0.11 |
| Other | 4.37 | 7.81 | 0.59 |
SE = Standard Error, Ref = Reference Level