Figure 1 The average quantitative ultrasound (QUS) biomarker values as boxplots, illustrating the distribution of values from the 10 scans for each participant across the 7 visits. Box plots of the mean QUS biomarkers for the pregnant (approximately 20 and 24 weeks of gestation, denoted as visits V1 and V2, respectively) and postpartum (approximately 6 weeks, and 3, 6, 9, and 12 months postpartum, denoted as V3–V7) cervix; (A) attenuation coefficient, (B) backscatter coefficient, (C) slope, (D) shear wave speed, and (E) intercept. The x represents the mean, the interior line in the box plots is the median value, the boxes represent the interquartile range (IQR), showing the spread of the middle 50% of the data, the whiskers extend to the minimum and maximum data values within the IQR. The outlier, represented by the degree sign (°), indicates a value that is significantly higher or lower than the IQR.