Weaning parameters for all subjects
| Weaning index | Number | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | ROC |
|---|---|---|---|---|---|---|
| Δtdi% | ||||||
| ≥30% | 63 | 88 | 71 | 91 | 63 | 0.79 |
| Δtdi%×VT | ||||||
| ≥80 | 62 | 88 | 71 | 91 | 63 | 0.76 |
| tdi at end-expiration | ||||||
| ≥0.17 cm | 63 | 90 | 21 | 80 | 38 | 0.61 |
| Δtdi/f | ||||||
| ≥0.008 | 62 | 92 | 67 | 90 | 71 | 0.75 |
Threshold for Δtdi%=30%; Threshold for Δtdi%×VT=80 (ml%); Threshold for tdi at end-expiration=0.17 cm; Threshold for Δtdi%/f=0.008 (%/breaths/min).
NPV, negative predictive value; PPV, positive predictive value; ROC, receiver operating characteristic; tdi, diaphragm thickness.