Figure 2.

Inter-observer agreement by plotting the mean differences against the mean values (method of Bland & Altman) for the following measurements: A. Diameter of the umbilical cord (cord₁ and cord₂ are respectively the measurements of observer 1 and 2); and B. diameter of the area of the umbilical cord (area₁ and area₂ are respectively the measurements of observer 1 and 2).