Table 1.

Reference data statistics

Recording	Duration [min:s]	Signal loss [%]	Number of heart beats	Mean FHR [bpm]	STI Mean ± SD
1	45:26	3.7	6015	132.2	9.17 ± 2.40
2	13:22	0.8	1188	127.7	7.37 ± 0.75
3	9:20	2.1	1742	130.4	6.54 ± 0.65

Descriptive statistics of the reference FHR signals derived from direct fetal electrocardiographic recordings