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Table 3 Stepwise multiple linear regression analysis for the effect of independent variables on rapid, tonic, and endurance contraction

From: Risk factors of pelvic floor muscle strength in south Chinese women: a retrospective study

Variables

 

Rapid contraction

Tonic contraction

Endurance contraction

B

β

t

 

B

β

t

 

B

β

t

(constant)

 

38.668

 

24.032

28.967

 

24.350

25.298

 

24.770

Age

 

-.298

-.066

-9.123***

-.354

-.107

-14.860***

-.310

-.109

-15.021***

BMI

(kg/m2)

 

.546

.085

12.877***

.366

.078

11.826***

.309

.076

11.503***

Parity

1

(ref.)

  

(ref.)

  

(ref.)

  

2

2.117

.055

7.578***

.905

.032

4.438***

.690

.029

3.962***

3

2.553

.025

3.650***

1.316

.018

2.576*

1.367

.021

3.135**

 ≥ 4

         

Education

 ≤ 12

(ref.)

  

(ref.)

  

(ref.)

  

 > 12

2.768

.058

8.743***

3.141

.090

13.586***

2.391

.080

12.116***

GWG

       

.046

.019

2.758**

NW

 

-1.199

-.034

-5.203***

-.380

-.015

-2.258*

-.436

-.020

-2.964**

NOF

1

(ref.)

  

(ref.)

  

(ref.)

  

 ≥ 2

         

DM

CS

(ref.)

  

(ref.)

  

(ref.)

  

NIVD

-10.639

-.292

-40.137***

-8.169

-.305

-42.202***

-7.445

-.324

-45.060***

EP

-12.060

-.216

-30.245***

-9.164

-.224

-31.470***

-8.385

-.239

-33.729***

FD

-20.159

-.176

-26.474***

-15.238

-.182

-27.403***

-13.342

-.185

-28.113***

F

 

281.255***

 

304.462***

 

304.302***

 

R2

 

0.106

  

0.114

  

0.125

  

adjR2

 

0.106

  

0.114

  

0.125

  
  1. BMI body mass index, GWG gestational weight gain, NW neonatal weight, NOF number of fetus, DM delivery mode, CS cesarean section, NIVD non-instrumental vaginal delivery, EP episiotomy, FD forceps delivery, B unstandardized beta, β standardized beta, t t test statistic
  2. *p < .05
  3. **p < .01
  4. ***p < .001
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BMC Pregnancy and Childbirth

ISSN: 1471-2393

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