Table 2 Flu-IV score and actual proportion of patients needing IMV
Score | Cases of IMV (n, %) | Sensitivity (%) | 95% CI | Specificity (%) | 95% CI | +LR | −LR |
|---|---|---|---|---|---|---|---|
− 3 | 0/11 (0.0) | 100.00 | 96.9–100.0 | 0.00 | 0.0–0.5 | 1.00 | |
− 2 | 0/58 (0.0) | 100.00 | 96.9–100.0 | 1.11 | 0.6–2.0 | 1.01 | 0.00 |
− 1 | 1/64 (1.6) | 100.00 | 96.9–100.0 | 6.97 | 5.5–8.7 | 1.07 | 0.00 |
0 | 1/98 (1.0) | 99.15 | 95.3–100.0 | 13.33 | 11.3–15.6 | 1.14 | 0.064 |
1 | 1/149 (0.7) | 98.29 | 94.0–99.8 | 23.13 | 20.5–25.9 | 1.28 | 0.074 |
2 | 1/124 (0.8) | 97.44 | 92.7–99.5 | 38.08 | 35.0–41.2 | 1.57 | 0.067 |
3 | 9/235 (3.8) | 96.58 | 91.5–99.1 | 50.51 | 47.3–53.7 | 1.95 | 0.068 |
4 | 4/157 (2.5) | 88.89 | 81.7–93.9 | 73.33 | 70.5–76.1 | 3.33 | 0.15 |
5 | 27/82 (32.9) | 85.47 | 77.8–91.3 | 88.79 | 86.7–90.7 | 7.62 | 0.16 |
6 | 23/71 (32.4) | 62.39 | 53.0–71.2 | 94.34 | 92.7–95.7 | 11.03 | 0.40 |
7 | 15/23 (65.2) | 42.74 | 33.6–52.2 | 99.19 | 98.4–99.7 | 52.88 | 0.58 |
8 | 35/35 (100.0) | 29.91 | 21.8–39.1 | 100.00 | 99.6–100.0 | 0.70 | |
9 | – | 0.00 | 0.0–3.1 | 100.00 | 99.6–100.0 | 1.00 |