Y. Noguchi et al., CONFIRMATION OF THE DISTRIBUTION OF MEASURED VALUES FROM AN ULTRASOUND FETAL HEART-RATE MONITOR, JPN J A P 1, 36(5B), 1997, pp. 3226-3227
To estimate the measurement error in an ultrasound fetal heart rate (F
HR) monitor, we compared the differences in the distribution of the FH
R measured with an ultrasound Doppler to the FHR measured with a direc
t fetal electrocardiogram. We confirm that (1) the distribution is ver
y similar to Student's t distribution, and (2) the number of degrees o
f freedom in Student's t distribution has a significant impact on the
evaluation of Bt.