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. Author manuscript; available in PMC: 2021 Apr 1.
Published in final edited form as: Int J Gynaecol Obstet. 2020 Jan 30;149(1):82–87. doi: 10.1002/ijgo.13096

Table 2.

Mean and SD values for maternal and fetal heart rate, SDNN, and RMSSD by behavioral state and time of the night.

First 2 hours Last 2 hours
Maternal
Heart rate SDNN RMSSD Heart rate SDNN RMSSD
Mean 79.18 31.74 22.42 77.90 36.98 31.94
SD 9.66 10.40 9.12 10.79 16.60 19.21
Fetal
Fetal state 1F 2F 1F 2F 1F 2F 1F 2F 1F 2F 1F 2F
Mean 136.30 138.30 7.40 15.46 7.55 9.16 133.10 137.10 7.54 14.59 7.73 9.05
SD 10.63 5.67 1.29 2.95 1.78 1.89 5.42 5.47 1.59 2.35 1.89 1.87

Abbreviations: RMSSD, root mean square of successive differences of RR intervals; SDNN, standard deviation of normal-to-normal RR intervals.