Table 3.

The AUCs of individual risk markers for fetuses of 23–34 weeks. Results are reported on a held out test set after training using five-fold cross-validation on training data (70/30 split). The best performing feature, the minutes per hour in high variation (HiMinph), was significantly superior than gestational age and markers associated with low variation episodes (p<0.01), with the exception of (LoMinph). No difference was found when comparing to features also derived from high variability episodes. Gender has been excluded from the analysis as it will not be available in anticipated use context.

	23–34 weeks gestation
Features*	Training data AUC (% [95% CI])
LTVinHi	74 [70–78]
LTVinLo	69 [65–73]
STVinHi	71 [67–75]
STVinLo	46 [41–50]
AvgDurHi	73 [69–76]
AvgDurLo	71 [66–75]
NoHiEpiph	75 [71–79]
NoLoEpiph	69 [65–73]
HiMinph	75 [71–79]
LoMinph	71 [67–75]
HiEpiStrtMin	63 [59–67]
RecGest	48 [43–52]

^*All features are defined in Table 2.