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Table 7 Relation between the IO width and the difference in EOD measured by both 2D and 3D TVS

From: Towards more accurate measurement of edge to os distance in low-lying placenta using three dimensional transvaginal ultrasound: an innovative technique

Pearson Correlation Difference between 2D and 3D measurements Sig. (one- tailed)
IO width 0.345 0.001