3.2. UC Identification and FHR Segmentation

We applied the GP-based UC identification method proposed in [15] for accessing the contraction information, such as onset, offset and peak time. With these data, we can mark the corresponding FHR segments during contractions and after contractions, as shown in Fig. 2. The 15-second window length is used after contractions. Note that, for any contraction event, if the FHR segments still contain more than 50% missing samples after pre-processing, this event is ignored. Besides, if the interval between two consecutive events is smaller than 15s, the first one will be discounted.