Table 1.
Accuracy of the f/VT ratio to predict weaning outcome in different studies
| Likelihood ratio (95% Cl) | Post-test probability of weaning success (%) | |||||
| Reference | Patients | Pretest probability of weaning success (%) | Positive* | Negative† | Positive* | Negative† |
| [6] | 64 Medical patients | 56 | 2.72 (1.50-5.17) | 0.04 (0.00-0.37) | 77 (65-87) | 5 (0-32) |
| [10] | 100 Medical patients | 63 | 1.49 (1.04-2.35) | 0.27 (0.08-0.88) | 72 (64-79) | 31 (12-60) |
| [11] | 185 Postoperative patients | 92 | 1.45 (1.07-2.56) | 0.09 (0.02-0.54) | 94 (92-97) | 51 (17-86) |
| [12] | 49 Medical patients (aged >70 years) | 77 | 2.70 (0.93-11.7) | 0.36 (0.15-1.10) | 90 (76-97) | 55 (33-79) |
Results are expressed as likelihood ratio. *Positivetest result is a value of rapid shallow breathing index (f/VT) lower than 105or 100; †negative test result is a value of f/VT higher than105 or 100.