The Use of Fetal Noninvasive Electrocardiography

Table 2

The amplitudes of the spectral peaks of umbilical blood flow velocity in the study population.

Frequency of peak	Group I	Group II	Group III
0.5 Hz, c.u.	0.14 ± 0.02	0.10 0.02	0.03 0.01
2 Hz, c.u.	0.16 0.01	0.12 0.01	0.18 0.04
7 Hz, c.u.	0.15 0.01	0.04 0.01	0.03 0.01

Notes: , the differences were statistically significant compared to Group I (); , the differences were statistically significant compared to Group II ().