Table 3.
Influenza A: diagnostic performance of ID NOW assay.
| RT-qPCR | ||||
|---|---|---|---|---|
| Positive (%) | Negative (%) | Total (%) | ||
| ID NOW | Whole population (n = 194) | |||
| Positive (%) | 27 (13.9) | 0 (0.0) | 27 (13.9) | |
| Negative (%) | 3 (1.5) | 164 (84.5) | 167 (86.1) | |
| Total (%) | 30 (15.5) | 164 (84.5) | 194 (100) | |
| 0–3 years (n = 101) | ||||
| Positive (%) | 13 (12.9) | 0 (0.0) | 13 (12.9) | |
| Negative (%) | 3 (3.0) | 85 (84.2) | 88 (87.1) | |
| Total (%) | 16 (15.8) | 85 (84.2) | 101 (100) | |
| >3 years (n = 93) | ||||
| Positive (%) | 14 (15.1) | 0 (0.0) | 14 (15.1) | |
| Negative (%) | 0 (0.0) | 79 (84.9) | 79 (84.9) | |
| Total (%) | 14 (15.1) | 79 (84.9) | 93 (100) | |
| Test performances | ||||
| % | 95% CI | |||
| Whole population (n = 194) | ||||
| PA | 90.0 | 73.5–97.9 | ||
| NA | 100 | 97.8–100 | ||
| PPV | 100 | 87.2–100 | ||
| NPV | 98.2 | 94.9–99.3 | ||
| LR+ | N/A | |||
| LR- | 0.1 | 0.03–0.29 | ||
| Accuracy | 98.4 | 95.5–99.7 | ||
| 0–3 years (n = 101) | ||||
| PA | 81.3 | 54.4–96.0 | ||
| NA | 100 | 95.8–100 | ||
| PPV | 100 | 75.3–100 | ||
| NPV | 96.6 | 91.1–98.7 | ||
| LR+ | N/A | |||
| LR− | 0.2 | 0.1–0.5 | ||
| Accuracy | 97.0 | 91.6–99.4 | ||
| >3 years (n = 93) | ||||
| PA | 100 | 76.8–100 | ||
| NA | 100 | 95.4–100 | ||
| PPV | 100 | 76.8–100 | ||
| NPV | 100 | 95.4–100 | ||
| LR+ | N/A | |||
| LR− | 0.0 | |||
| Accuracy | 100 | 96.1–100 | ||
N/A: not available.