Table 2.
SARS-CoV-2: diagnostic performance of ID NOW assay.
| RT-qPCR | ||||
|---|---|---|---|---|
| Positive (%) | Negative (%) | Total (%) | ||
| ID NOW | Whole population (n = 194) | |||
| Positive (%) | 7 (3.6) | 2 (1.0) | 9 (4.6) | |
| Negative (%) | 7 (3.6) | 178 (91.8) | 185 (95.4) | |
| Total (%) | 14 (7.2) | 180 (92.8) | 194 (100) | |
| 0–3 years (n = 101) | ||||
| Positive (%) | 4 (4.0) | 2 (1.9) | 6 (5.9) | |
| Negative (%) | 3 (3.0) | 92 (91.1) | 95 (94.1) | |
| Total (%) | 7 (7.0) | 94 (93.0) | 101 (100) | |
| >3 years (n = 93) | ||||
| Positive (%) | 3 (3.2) | 0 (0.0) | 3 (3.2) | |
| Negative (%) | 4 (4.3) | 86 (92.5) | 90 (96.8) | |
| Total (%) | 7.5 (7.5) | 86 (92.5) | 93 (100) | |
| Test performances | ||||
| % | 95% CI | |||
| Whole population (n = 194) | ||||
| PA | 50.0 | 23.0–77.0 | ||
| NA | 98.9 | 96.0–99.9 | ||
| PPV | 77.8 | 44.5–93.9 | ||
| NPV | 96.2 | 93.8–97.7 | ||
| LR+ | 45.0 | 10.3–196.6 | ||
| LR− | 0.5 | 0.30–0.85 | ||
| Accuracy | 95.5% | 91.4–97.9 | ||
| 0–3 years (n = 101) | ||||
| PA | 57.1 | 18.4–90.1 | ||
| NA | 97.9 | 92.5–99.7 | ||
| PPV | 66.7 | 30.6–90.1 | ||
| NPV | 96.8 | 92.9–98.6 | ||
| LR+ | 26.9 | 5.9–122.0 | ||
| LR− | 0.4 | 0.2–1.0 | ||
| Accuracy | 95.0% | 88.8–98.4 | ||
| >3 years (n = 93) | ||||
| PA | 42.9 | 9.9–81.6 | ||
| NA | 100 | 95.8–100 | ||
| PPV | 100 | 29.2–100 | ||
| NPV | 95.6 | 91.9–97.6 | ||
| LR+ | NA | N/A | ||
| LR− | 0.6 | 0.3–1.1 | ||
| Accuracy | 95.7 | 89.3–98.8 | ||
N/A: not available.