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Table 5 Comparisons of transvaginal 2D SWE outcomes between patients with horizontal and vertical cervical positions, shown as mean ± SD, median (25th -75th percentile)

From: Evaluation of the stiffness of normal cervix and its change with different factors using transvaginal two-dimensional shear wave elastography under strict quality control

Cervical position

Internal cervical os of midsagittal planes

External cervical os of midsagittal planes

Emean

Emax

Emin*

Emean*

Emax

Emin*

Horizontal position

(n = 104)

45.74 ± 7.30

46.26 (42.40-50.52)

51.33 ± 6.85

52.36 (47.29–55.13)

39.48 ± 7.98

40.17 (35.95–45.04)

21.88 ± 9.23

22.29 (14.49–27.77)

28.72 ± 9.41

29.37 (21.85–35.46)

14.76 ± 8.48

13.75 (8.00-20.56)

Vertical position

(n = 96)

43.63 ± 5.07

43.51 (40.74–47.14)

48.23 ± 5.19

47.91 (44.67-52.00)

37.33 ± 6.23

38.00 (33.93–41.87)

24.36 ± 9.12

24.28 (16.49–32.08)

30.22 ± 9.27

30.02 (23.37–36.97)

17.60 ± 8.76

17.17 (10.65–23.36)

t/Z

2.393

3.633

2.563

1.792

1.131

2.289

P

0.018

< 0.001

0.010

0.073

0.259

0.022

  1. * means non-normal distribution
  2. 2D SWE: two-dimensional shear wave elastography; SD: standard deviation; Emean: mean elasticity; Emax: maximal elasticity; Emin: minimal elasticity