Table 6.
Relative errors δ for STV and LTV variability indices, determined for original signals FHR_CTG from a fetal monitor output, and for FHR_U from the new Doppler ultrasound signal analysis methods, in relation to the FHR_E reference signal from FECG.
| δ (%) | FHR Determination Method | ||
|---|---|---|---|
| FHR_CTG | FHR_U D1 | FHR_U D2 | |
| STV | |||
| δS_DAW | −66.2 ± 7.99 # | −6.4 ± 6.25 | −5.0 ± 4.75 |
| δS_YEH | −50.8 ± 11.07 | −3.0 ± 7.69 | −2.4 ± 6.78 |
| δS_HAA | −80.0 ± 7.27 | −13.3 ± 12.32 | −8.9 ± 12.02 |
| δS_ZUG | −51.5 ± 9.28 | −2.1 ± 9.09 | −1.9 ± 8.15 |
| δS_HUE | −91.3 ± 8.73 | −11.9 ± 16.07 | −10.1 ± 12.00 |
| δS_DAL | −65.5 ± 7.59 | −6.9 ± 6.25 | −5.4 ± 4.72 |
| LTV | |||
| δL_DAW | −10.3 ± 9.00 | −0.7 ± 6.47 | −0.1 ± 5.76 |
| δL_YEH | −6.3 ± 6.78 | −0.3 ± 2.79 | −0.1 ± 2.36 |
| δL_HAA | −2.3 ± 11.16 | −1.4 ± 6.89 | −0.9 ± 5.09 |
| δL_ZUG | −6.7 ± 7.26 | −0.2 ± 2.50 | −0.1 ± 2.19 |
| δL_HUE | 9.80 ± 16.95 | −1.3 ± 10.22 | −1.3 ± 8.04 |
| δL_DAL | −5.9 ± 6.93 | −0.1 ± 2.87 | −0.1 ± 2.14 |
# mean value ± SD.