Fig. 5

Bland–Altman plots with 95% limits of agreement showing inter-observer agreement of mean gestational sac diameter measurements of observer 1 and observer 2. Y axis title: Difference in MSD (mm). Y axis scale = 1. From − 5, − 4, − 3, − 2, − 1, 0, 1, 2, 3, 4, to 5. X axis title: Mean of MSD measurements of observers 1 and 2 (mm). X axis scale = 10. Start and end point: 0, 10, 20, 30, 40, 50, 60. ▬▬▬▬▬▬ Reference point where the mean difference between repeated measures is equal to zero. ▬ ▬ ▬ ▬ ▬ ▬ The upper and lower limit of the 95% confidence interval of limits of agreement