Table 2.
Differences of complexity indices between patient subgroups
| Parameter | Median | 95% CI | Range | p value |
|---|---|---|---|---|
| (SE) | (Lower-upper bounds) | (10-90% percentiles) | ||
| Sample entropy of flow | ||||
| S | 1.26 (0.035) | 1.16-1.32 | 0.87-1.46 | < 0.001 |
| U | 0.88 (0.027) | 0.77-0.94 | 0.65-1.21 | |
| Sample entropy of VT | ||||
| S | 1.27 (0.075) | 0.89-1.47 | 0.86-1.44 | < 0.001 |
| U | 0.79 (0.029) | 0.54-1.13 | 0.64-1.92 | |
| DFA exponent of flow | ||||
| S | 0.81 (0.034) | 0.43-1.35 | 0.72-0.95 | < 0.001 |
| U | 1.08 (0.05) | 0.76-1.13 | 0.94-1.25 | |
| Largest Lyapunov exponent of flow | ||||
| S | 0.76 (0.045) | 0.56-1.22 | 0.48-1.11 | < 0.001 |
| U | 0.27 (0.014) | 0.14-0.55 | 0.09-0.42 |
Statistical significant differences of various complexity indices derived from mean inspiratory flow and tidal volume (VT) time series analysis, between weaning success (S, n = 22) and weaning failure (U, n = 10) patients. Variables are those that correspond to metrics at the end of the SBT and are presented as median with standard error (SE), along with 95% confidence intervals (CI).