Table 1 Univariate Analysis and multivariate logistic regression analysis of clinical and ultrasonic characteristics

Age

31.0 (29.0 ~ 35.0)

30.0 (27.8 ~ 32.0)

-4.671

 < 0.001

1.215 (1.097–1.346)

 < 0.001

Parity

 1

35 (33.33%)

95 (63.33%)

22.56

 < 0.001

Ref

–

 2

60 (57.14%)

49 (32.67%)

3.059 (1.506–6.216)

0.002

 3

10 (9.52%)

6 (4%)

5.014 (1.322–19.016)

0.018

Vaginal delivery

 Yes

92 (87.62%)

85 (56.67%)

27.87

 < 0.001

3.053 (1.328–7.016)

0.009

 No

13 (12.38%)

65 (43.33%)

Angle of internal urethral orifice funnel

24.0 (16.0 ~ 34.5)

12.5 (7.0 ~ 18.0)

-8.117

 < 0.001

1.133 (1.091–1.176)

 < 0.001

Bladder neck descent

1.5 (1.3 ~ 2.2)

1.3 (1.2 ~ 1.5)

-3.480

 < 0.001

4.159 (2.010–8.605)

 < 0.001

Urethral rotation angle

20.0 (15.0 ~ 26.0)

19.0 (15.0 ~ 25.0)

-0.702

0.483

 Retrovesical angle

150.0 (145.0 ~ 157.0)

150.0 (144.8 ~ 156.0)

-0.898

0.369

 Levator hiatal area

18.5 (15.5 ~ 19.9)

16.5 (15.2 ~ 19.0)

-1.717

0.086

 Thickness of left puborectalis muscle

1.00 (0.90 ~ 1.05)

0.98 (0.82 ~ 1.08)

-0.716

0.474

 Thickness of right puborectalis muscle

0.98 (0.90 ~ 1.11))

1.00 (0.90 ~ 1.10)

-1.658

0.097