Table 4.
Results of the analysis performed in a population of 61 normal and 61 IUGR fetuses. FHR signals were collected through CTG recordings.
| Parameter | Healthy (mean ± std) |
IUGR (mean ± std) |
t-test | p-value | |
|---|---|---|---|---|---|
|
|
|||||
| Time | |||||
|
| |||||
| Variability in time domain (clinical use) | Delta (ms) | 41.5 ± 6.4 | 29.6 ± 9.3 | b | 6.3* 10−7 |
| STV (ms) | 6.7 ± 2.24 | 4.29 ± 1.62 | c | 1.22* 10−9 | |
| LTI (ms) | 21.46 ± 6.53 | 17.17 ± 5.37 | c | 1.5* 10−11 | |
|
| |||||
| Nonlinear | |||||
|
| |||||
| Complexity and nonlinearity | ApEn(1, 0.1) | 1.33 ± 0.13 | 1.21 ± 0.11 | b | 5.14* 10–7 |
| Lempel ziv complexity (2, 0) | 1.00 ± 0.08 | 0.94 ± 0.09 | a | 0.000 78 | |
| SampEn(1, 0.1) | 1.3 ± 0.19 | 1.13 ± 0.15 | b | 2.08* 10−7 | |
|
| |||||
| PRSA | |||||
|
| |||||
| Signal oscillations | APRS | 0.17 ± 0.041 | 0.12 ± 0.042 | c | 7.76* 10−12 |
| DPRS | −0.18 ± 0.046 | −0.12 ± 0.042 | c | 1.08* 10−13 | |