Table 4.
Influenza B: diagnostic performance of ID NOW assay.
| RT-qPCR | ||||
|---|---|---|---|---|
| Positive (%) | Negative (%) | Total (%) | ||
| ID NOW | Whole population (n = 194) | |||
| Positive (%) | 27 (13.9) | 1 (0.5) | 28 (14.4) | |
| Negative (%) | 0 (0.0) | 166 (85.6) | 166 (85.6) | |
| Total (%) | 27 (13.9) | 167 (86.1) | 194 (100) | |
| 0–3 years (n = 101) | ||||
| Positive (%) | 3 (3.0) | 0 (0.0) | 3 (3.0) | |
| Negative (%) | 0 (0.0) | 98 (97.0) | 98 (97.0) | |
| Total (%) | 3 (3.0) | 98 (97.0) | 101 (100) | |
| >3 years (n = 93) | ||||
| Positive (%) | 24 (25.8) | 1 (1.1) | 25 (26.9) | |
| Negative (%) | 0 (0.0) | 68 (73.1) | 68 (73.1) | |
| Total (%) | 24 (25.8) | 69 (74.2) | 93 (100) | |
| Test performances | ||||
| % | 95% CI | |||
| Whole population (n = 194) | ||||
| PA | 100 | 87.2–100 | ||
| NA | 99.4 | 96.7–100 | ||
| PPV | 96.4 | 79.3–99.5 | ||
| NPV | 100 | 97.8–100 | ||
| LR+ | 167 | 23.7–1178.6 | ||
| LR− | 0.0 | |||
| Accuracy | 99.5 | 97.2–99.9 | ||
| 0–3 years (n = 101) | ||||
| PA | 100 | 29.2–100 | ||
| NA | 100 | 96.3–100 | ||
| PPV | 100 | 29.2–100 | ||
| NPV | 100 | 96.3–100 | ||
| LR+ | N/A | |||
| LR− | 0.0 | |||
| Accuracy | 100 | 96.4–100 | ||
| >3 years (n = 93) | ||||
| PA | 100 | 85.8–100 | ||
| NA | 98.6 | 92.2–100 | ||
| PPV | 96.0 | 77.4–99.4 | ||
| NPV | 100 | 94.7–100 | ||
| LR+ | 69.0 | 9.9–482.9 | ||
| LR− | 0.00 | |||
| Accuracy | 98.9 | 94.1–99.9 | ||
N/A: not available.