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Table 6 Comparisons of transvaginal 2D SWE outcomes among patients with different delivery times, 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

Parity

Internal cervical os of midsagittal planes

External cervical os of midsagittal planes

Emean

Emax

Emin*

Emean*

Emax

Emin*

0 (n = 69)

44.40 ± 6.97

44.90 (40.43–49.60)

49.77 ± 6.95

49.94 (44.60-54.42)

38.33 ± 7.44

39.27 (35.24–43.84)

23.39 ± 9.12

23.49 (15.64–29.33)

30.42 ± 9.27

30.18 (23.30-37.46)

16.11 ± 8.94

14.77 (8.15–22.52)

1(n = 90)

44.97 ± 5.84

44.66 (42.15–49.17)

49.88 ± 5.85

49.57 (46.81–53.73)

38.69 ± 6.70

39.47 (35.33–42.69)

22.52 ± 8.59

22.85 (15.02–28.26)

28.30 ± 9.20

29.34 (21.30-33.97)

15.65 ± 7.92

15.03 (8.83–20.71)

≥ 2(n = 41)

44.74 ± 6.71

45.09 (39.62–50.01)

49.89 ± 6.20

50.58 (44.49–54.08)

38.10 ± 8.24

39.37 (32.83–44.32)

23.74 ± 10.27

23.96 (14.83–32.55)

30.30 ± 9.76

31.54 (22.35–37.27)

17.19 ± 10.03

16.24 (9.68–23.3)

F/χ 2

0.156

0.007

0.013

0.633

1.231

0.681

P

0.856

0.993

0.994

0.729

0.294

0.711

  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