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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