Skip to main content

Table 3 Intra-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) -0.120 (0.960) (-0.248; 0.007) 0.734 0.95 0.96 0.98
Diameter of the artery (mm) -0.137 (0.576) (-0.213; -0.06) 0.332 0.86 0.88 0.94
Diameter of the vein (mm) 0.011 (0.763) (-0.09; 0.113) 0.917 0.92 0.94 0.97
Area of the cord (mm2) -2.500 (24.390) (-5.74; 0.73) 0.732 0.95 0.95 0.97
  1. * Mann-Whitney's non parametric test.
  2. R: Spearman's correlation coefficient (p < 0.0001).
  3. ICC: intraclass correlation coefficient (internal consistency)