New Estimators and Guidelines for Better Use of Fetal Heart Rate Estimators with Doppler Ultrasound Devices

Table 1

Statistics evaluated using (2143) patterns: 𝑀_𝑖 represents the statistics of the maxima, where 𝑖=1,…,4,  𝑑𝑃₁𝑃₂, 𝑑𝑃₂𝑃₃, 𝑑𝑃₃𝑃₄ represent the differences between the positions of two adjacent maxima over time; 𝑑𝑀₂𝑀₁, 𝑑𝑀₁𝑀₄, 𝑑𝑀₄𝑀₃ represent statistical differences between two adjacent maxima over time, and 𝑇 represents the statistics of the peak durations. We found that the statistics of the four peaks of 𝑇_𝑖, 𝑖=1,…,4, were identical.

	Law
	Gaussian	Uniform
𝑀1	89.06±31.48
𝑀2	69.70±21.84
𝑀3	54.80±19.21
𝑀4	36.28±18.28
𝑑𝑀2𝑀1		(5--50)
𝑑𝑀1𝑀3		(5--50)
𝑑𝑀3𝑀4		(5--40)
𝑑𝑃1𝑃2	41.50±18.18
𝑑𝑃2𝑃3	92.92±27.76
𝑑𝑃3𝑃4	47.81±30.09
𝑇 (ms)		(25--45)