Table 2. Diagnostic Values of Suprasternal and Subxiphoid Ultrasounds Relative to Capnography for Confirming the Accuracy of Intubation.
| Diagnostic Test | Gold Standard | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | LR+ | LR- | DOR | |
|---|---|---|---|---|---|---|---|---|---|
| Positive | Negative | ||||||||
| Suprasternal sonography | 98.33 | 66.67 | 96.72 | 80 | 1.49 | 1.45 | 1.026 | ||
| Positive | 59 | 2 | |||||||
| Negative | 1 | 4 | |||||||
| Subxiphoid sonography | 80 | 83.33 | 97.95 | 29.41 | 0.97 | 0.94 | 1.024 | ||
| Positive | 48 | 1 | |||||||
| Negative | 12 | 5 | |||||||
Abbreviations: PPV, positive predictive value; NPV, negative predictive value; LR+, positive likelihood ratio; LR-, negative likelihood ratio; DOR, diagnostic odds ratio.