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Table 4 Comparison of the mean EOD as measured by 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

  

2D TVS

3D TVS

Paired sample t-test

Edge to os distance

Mean distance

24.26 ± 7.08

18.3 ± 6.30

0.000

Groups

n (%)

n (%)

Chi-Square test

≤ 10 mm

1 (1.3%)

8 (10.5%)

0.000

11–20 mm

22 (28.9%)

42 (55.3%)

21–30 mm

34 (44.7%)

23 (30.3%)

31–35 mm

19 (25%)

3 (3.9%)

  1. Patients were stratified according to the EOD by both methods