Fig. 1
From: Circadian changes and sex-related differences in fetal heart rate parameters
Analysis of Day: Night Changes in Basal Fetal Heart Rate. The day:night change in basal fetal heart rate (bFHR) increased significantly with gestation age at the time of recording (r = −0.409; P < 0.002). The place of recording also exerted an additive significant effect (final r = −0.554; P < 0.001)