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Table 2 Inter-observer variability in the ultrasonographic measurements of the umbilical cord (n = 221)

From: Inter- and intra-observer variability in Sonographic measurements of the cross-sectional diameters and area of the umbilical cord and its vessels during pregnancy

Characteristics Mean Difference (SD) 95%CI p* R ICC Crombach's alpha
Diameter of the cord (mm) 0.024 (1.208) (-0.136; 0.185) 0.896 0.90 0.94 0.97
Diameter of the artery (mm) -0.057 (0.677) (-0.147; 0.032) 0.728 0.79 0.83 0.91
Diameter of the vein (mm) 0.045 (0.907) (-0.075; 0.166) 0.800 0.90 0.91 0.95
Area of the cord (mm2) 1.088 (30.120) (-2.905; 5.081) 0.903 0.90 0.92 0.96
  1. * Mann-Whitney's non parametric test.
  2. R: Spearman's correlation coefficient (p < 0.0001).
  3. ICC: intraclass correlation coefficient (internal consistency).