Table 4.
Correlation dimension of the RI and RE time series during the three ventilatory modes and comparison with surrogate data
|
ACV |
IPS
|
USB
|
P Value | ||||
|---|---|---|---|---|---|---|---|
| RI | RE | RI | RE | RI | RE | ||
| Original | 2.47±0.21 | 2.51±0.33 | 2.22±0.22 | 2.38±0.19 | 2.36±0.29 | 2.6±0.26 | P = 0.07 RI vs. RE; P = 0.03 ACV vs. IPS vs. USB |
| Surrogate | 2.67±0.27 | 2.8±0.11 | 2.42±0.21 | 2.57±0.18 | 2.55±0.29 | 2.67±0.23 | P < 0.001 Surrogate vs. original |
Data are means ± SD, 2-way ANOVA was used to study the effects of ventilator mode (ACV, IPS, USB) and respiratory timing (RI versus RE) on the original time series. Comparison between surrogate data and original data was performed using Wilcoxon matched-pairs signed rank test.