Descriptive statistics of the three lung ultrasound protocols vs final diagnosis
| Diagnostic accuracy | 6-points protocol vs final diagnosis | 8-points protocol vs final diagnosis | 12-zone vs final diagnosis |
| Sensitivity (%) (95% CI) | 89.5 (82.0 to 94.7) | 81.0 (72.1 to 88.0) | 91.4 (84.4 to 96.0) |
| Specificity (%) (95% CI) | 65.0 (54.6 to 74.4) | 78.4 (68.8 to 86.1) | 83.5 (74.6 to 90.3) |
| Positive likelihood ratio | 2.6 (1.9 to 3.4) | 3.7 (2.5 to 5.5) | 5.6 (3.6 to 8.8) |
| Negative likelihood ratio | 0.16 (0.09 to 0.3) | 0.2 (0.2 to 0.4) | 0.1 (0.05 to 0.2) |
| Positive predictive value (%) (95% CI) | 73.4 (67.7 to 78.5) | 80.2 (73.3 to 85.7) | 85.7 (79.2 to 90.4) |
| Negative predictive value (%) (95% CI) | 85.1 (76.3 to 91.1) | 79.2 (71.7 to 85.1) | 90.0 (82.7 to 94.4) |
| Accuracy (%) | 77.7 (71.4 to 83.3) | 79.7 (73.5 to 85.0) | 87.6 (82.3 to 91.8) |