Table 3.
Influenza diagnosis (ICD-10-AM J09-J11) versus laboratory test results by time of test result availability
| Influenza diagnosis | Test results received before discharge (n = 14,285) | Test results after discharge (n = 2154) | ||||
|---|---|---|---|---|---|---|
| PCR+ | PCR− | Total | PCR+ | PCR− | Total | |
| ICD10+ | 2280 | 132 | 2412 | 101 | 14 | 115 |
| ICD10− | 170 | 11,703 | 11,873 | 208 | 1831 | 2039 |
| Total | 2450 | 11,835 | 14,285 | 309 | 1845 | 2154 |
| Accuracy measures | ||||||
| Sensitivity (95% CI) | 93.1 (92.0–94.0) | 32.7 (27.5–38.2) | ||||
| Specificity (95% CI) | 98.9 (98.7–99.1) | 99.2 (98.7–99.6) | ||||
| PPV (95% CI) | 94.5 (93.5–95.4) | 87.8 (80.4–93.2) | ||||
| NPV (95% CI) | 98.6 (98.3–98.8) | 89.8 (88.4–91.1) | ||||
PPV positive predictive value, NPV negative predictive value