Table 4. Predictive values for intensive care unit transfers.
| Variables | Sensitivity | Specificity | PPV | NPV | PLR | NLR |
|---|---|---|---|---|---|---|
| SF ratio* ≤ 170† | 52.2 (41.4–62.9) | 89.6 (86.0–82.5) | 55.3 (44.1–66.1) | 88.4 (84.7–91.5) | 5.0 (3.5–7.2) | 0.53 (0.3–0.7) |
| SF ratio ≤ 200 | 54.4 (43.6–65.0) | 83.8 (79.1–87.0) | 46.7 (36.9–56.7) | 88.3 (84.5–91.5) | 3.38 (2.5–4.6) | 0.54 (0.4–0.7) |
| SF ratio ≤ 250 | 65.6 (54.8–75.3) | 67.7 (62.7–72.5) | 33.3 (26.4–40.8) | 88.9 (84.6–92.3) | 2.03 (1.6–2.5) | 0.51 (0.4–0.7) |
| SF ratio ≤ 300 | 78.8 (69.0–86.8) | 53.8 (48.6–59.0) | 29.8 (24.1–36.1) | 91.3 (86.7–94.7) | 1.71 (1.5–2.0) | 0.39(0.3–0.6) |
Sensitivity, specificity, PPV, and NPV were presented percentage (95% CIs). PLR and NLR were presented ratio (95% CIs). CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; PLR, positive likelihood ratio; NLR, negative likelihood ratio.
*SF ratio: SpO2/FiO2 ratio
†Youden index point.