Diagnostic accuracy results from the validation phase
| pH | + | + | − | − | |
|---|---|---|---|---|---|
| Lipase test | True status | + | − | + | − |
| + | + | 23 | 11 | ||
| + | − | 0 | 0 | ||
| − | + | 0 | 1 | ||
| − | − | 0 | 1 |
| pH (%) | Lipase test (%) | |
|---|---|---|
| Sensitivity | 65.7 | 97.2 |
| Specificity | 100 | 100 |
| Positive predictive value | 100 | 100 |
| Negative predictive value | 7.7 | 50 |
+, Indicates correct nasogastric tube placement; −, indicates incorrect nasogastric tube placement.