Fig 1.
Non-invasive fetal electrocardiogram (NI-FECG) showing both maternal and fetal R-waves.
Table 1.
Classification of heart rate pattern used in the selection of time series.
Fig 2.
An example of the selection of time series, where time series 1 and 2 within each heart rate pattern were compared according to reliability.
Fetal ECG: Non-invasive fetal electrocardiography, SHRP: Stationary heart rate pattern, HRP: Heart rate pattern [10].
Fig 3.
Rate of usable non-invasive fetal ECG recordings divided into gestational age (GA) in weeks.
Table 2.
Characteristics of included women.
Table 3.
Reliability of time domain and spectral domain parameters from gestational age 20+0 to 41+0 divided into heart rate pattern and length of time series.
(Based on the pairwise comparison of two measurements from the same recording).
Table 4.
Reliability of SDNN and RMSSD divided into gestational age groups, heart rate pattern and length of time series.
(Based on the pairwise comparison of two measurements from the same recording).