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Table 2 The accuracy of interval measurement

From: A novel technique for fetal heart rate estimation from Doppler ultrasound signal

Window length

Δ ¯ T i ± SD [ms]

∣ Δ T i ¯ ∣ [ms]

Median (|ΔTi|) [ms]

1.5

1.48 ± 6.82

2.58

1.04

1.75

0.24 ± 3.35

1.73

1.00

2

0.18 ± 3.05

1.68

1.02

2.25

0.08 ± 3.51

1.82

1.07

2.5

0.09 ± 3.59

1.94

1.15

3

0.19 ± 3.67

2.11

1.30

3.5

0.33 ± 4.13

2.40

1.45

4

0.48 ± 4.54

2.70

1.60

  1. The descriptive statistics of differences between intervals derived from the Doppler ultrasound signal and the reference direct fetal electrocardiogram. The results were obtained on the basis of 8945 interval measurements.
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