TABLE 2.
Comparison between NPS and saliva samples
| Sampling characteristic | NPS | Saliva | P value |
|---|---|---|---|
| N | 909 | 380 | |
| Ct, median (IQR) | 24 (20, 31) | 29 (26, 32) | <0.001 |
| VOC | 0.5 | ||
| Available | 396 | 133 | |
| Alpha | 108 (27%) | 32 (24%) | |
| Beta/Gamma | 12 (3%) | 1 (0.8%) | |
| Delta | 48 (12%) | 20 (15%) | |
| Omicron | 202 (51%) | 72 (54%) | |
| Other | 26 (6.6%) | 8 (6%) | |
| Not available (NA) | 513 | 247 | |
| RT-PCR assays | <0.001 | ||
| ROC | 483 (53%) | 299 (79%) | |
| ALI | 175 (19%) | 74 (19%) | |
| NMDx | 147 (16%) | 4 (1.1%) | |
| CPH | 25 (2.8%) | 3 (0.8%) | |
| SPX | 79 (8.7%) | 0 | |
| Period of sampling, n (%) | 0.05 | ||
| Period 1, Alpha wave | 279 (31%) | 61 (16%) | |
| Period 2, Delta wave | 73 (8%) | 48 (13%) | |
| Period 3, Omicron wave | 557 (61%) | 271 (71%) |