Table 2.

Selected features from cardiotocographic risk markers, trace characteristics and patient information for IUGR classification.

Risk marker (feature) [unit]	Definition
LTVinHi [ms]	The long-term variability averaged over periods of high heart rate variation.
STVinHi [ms]	The short-term variability averaged over periods of high heart rate variation.
LTVinLo [ms]	The long-term variability averaged over periods of low heart rate variation.
STVinLo [ms]	The short-term variability averaged over periods of low heart rate variation.
NoHiEpi [ph]	The number of high variation episodes normalized by the length of the recording.
NoLoEpi [ph]	The number of low variation episodes normalized by the length of the recording.
HiMin [ph]	The number of minutes in high variation normalized by the length of the recording.
LoMin [ph]	The number of minutes in low variation normalized by the length of the recording.
AvgDurHi [min]	The average duration of episodes of high variation.
AvgDurLo [min]	The average duration of episodes of low variation.
HiEpiStrt [min]	The onset of the first high variation episode.
RecGest [weeks]	The gestational age as estimated at time of recording.