Table 2.
Cut-off points for combined sensitivity and specificity with best score (Youden test) on the NEWS2 scale as a function of mortality (2, 7, and 30 days) and of the assigned triage level.
| n (%)] | Mortality | M2D: 55 (5.2) | M7D: 81 (7.7) | M30D: 119 (11.3) |
|---|---|---|---|---|
| Triage | ||||
| Level I 94 (8.9) |
Cut-offs (points) | 9 | 10 | 9 |
| Se % [CI 95%] | 82.6 (62.9-93.0) | 78.8 (62.2-89.3) | 77.5 (62.5-87.7) | |
| Sp % [CI 95%] | 69.0 (57.5-78.6) | 82.0 (70.5-89.6) | 81.5 (69.2-89.6) | |
| PPV [CI 95%] | 46.3 (32.1-61.3) | 70.3 (54.2-82.5) | 75.6 (60.7-86.2) | |
| NPV [CI 95%] | 92.5 (82.1-97.0) | 87.7 (76.8-93.9) | 83.0 (70.8-90.8) | |
| LR (+)[CI 95%] | 2.67 (1.80-3.96) | 4.37 (2.49-7.68) | 4.19 (2.33-7.50) | |
| LR (-)[CI 95%] | 0.25 (0.10-0.63) | 0.26 (0.13-0.51) | 0.28 (0.15-0.50) | |
| OR [IC 95%] | 10.58 (3.22-34.77) | 16.88 (5.85-48.71) | 15.16 (5.51-41.66) | |
| DA [IC 95%] | 72.3 (62.6-80.4) | 80.9 (71.7-87.5) | 79.8 (70.6-86.7) | |
|
| ||||
| Level II 410 (38.8) |
Cut-offs (points) | 9 | 9 | 8 |
| Se % [CI 95%] | 81.5 (63.3-91.8) | 73.0 (57.0-84.9) | 69.6 (56.7-80.1) | |
| Sp % [CI 95%] | 78.3 (73.9-82.2) | 79.1 (74.7-82.9) | 73.7 (68.9-78.0) | |
| PPV [CI 95%] | 21.0 (14.3-29.7) | 25.7 (18.3-34.8) | 29.5 (22.4-37.8) | |
| NPV [CI 95%] | 98.4 (96.2-99.3) | 96.7 (94.1-98.2) | 93.9 (90.4-96.1) | |
| LR (+)[CI 95%] | 3.76 (2.89-4.89) | 3.49 (2.64-4.61) | 2.65 (2.07-3.39) | |
| LR (-)[CI 95%] | 0.24 (0.11-0.52) | 0.34 (0.20-0.59) | 0.41 (0.27-0.62) | |
| OR [IC 95%] | 15.90 (5.84-43.27) | 10.21 (4.74-21.99) | 6.44 (3.47-11.93) | |
| DA [IC 95%] | 78.5 (74.3-82.2) | 78.5 (74.3-82.2) | 73.2 (68.7-77-2) | |
|
| ||||
| Level III 550 (51.1) |
Cut-offs (points) | 7 | 9 | 6 |
| Se % [CI 95%] | 100 (56.6-100) | 63.6 (35.4-84.8) | 69.6 (49.1-84.4) | |
| Sp % [CI 95%] | 78.7 (75.1-81.9) | 89.6 (86.7-91.9) | 73.1 (69.1-76.7) | |
| PPV [CI 95%] | 4.1 (1.8-9.3) | 11.1 (5.5-21.2) | 10.1 (6.3-15.8) | |
| NPV [CI 95%] | 100 (99.1-100) | 99.2 (97.9-99.7) | 98.2 (96.4-99.1) | |
| LR (+)[CI 95%] | 4.70 (4.0-5.52) | 6.13 (3.67-10.21) | 2.58 (1.90-3.50) | |
| LR (-)[CI 95%] | 0 (0-7.78) | 0.41 (0.18-0.89) | 0.42 (0.22-0.78) | |
| OR [IC 95%] | ∞ (3.32- ∞) | 15.09 (4.28-53.17) | 6.20 (2.50-15.38) | |
| DA [IC 95%] | 78.9 (75.3-82.1) | 89.1 (86.2-91.4) | 72.9 (69.0-76.5) | |
M2D: mortality 2 days; M7D: mortality 7 days; M30D: mortality 30 days; CI: confidence interval; Se: Sensitivity; Sp: Specificity; PPV: positive predictive value: NPV: negative predictive value; LR: likelihood ratio; OR: odds ratio; DA: diagnostic accuracy.
∗Maximum (sensitivity + specificity -1).