Table 3 Multiple stepwise regression analysis for prediction formulas of SS, PT, TPA and SVA.

From: Prediction formulae of sagittal alignment in thoracolumbar kyphosis secondary to ankylosing spondylitis after osteotomy

Model

Variables

Unstandardized coefficients

Standardized coefficients

T

P value

VIF

Adjusted R2

B

Standard error

Beta

SS

(Constant)

 − 12.791

3.102

 − 

 − 4.123

 < 0.001

–

68.3%

LL

 − 0.765

0.064

 − 1.146

 − 11.899

 < 0.001

2.463

PI-LL

0.357

0.071

0.487

5.054

 < 0.001

2.463

PT

(Constant)

12.108

3.206

–

3.777

 < 0.001

–

56.8%

PI-LL

0.402

0.046

0.644

8.717

 < 0.001

1.062

PI

0.252

0.067

0.277

3.751

 < 0.001

1.062

TPA

(Constant)

0.225

2.133

–

0.105

0.916

–

87.4%

PT

0.597

0.071

0.519

8.452

 < 0.001

2.431

PI-LL

0.464

0.065

0.642

7.147

 < 0.001

5.207

LL

 − 0.161

0.044

 − 0.245

 − 3.616

0.001

2.969

SVA

(Constant)

36.157

24.917

–

1.451

0.151

–

41.5%

PI-LL

2.790

0.427

0.790

6.533

 < 0.001

2.001

Age

1.657

0.580

0.250

2.857

0.005

1.051

PT

 − 1.813

0.693

 − 0.322

 − 2.617

0.011

2.072

  1. SS sacral slope, LL lumbar lordosis, PI pelvic incidence, PI-LL PI and LL mismatch, PT pelvic tilt, TPA T1 pelvic angel, SVA sagittal vertical axis.
  2. Model SS: Durbin-Watson = 1.939; Model PT: Durbin-Watson = 1.921; Model TPA: Durbin-Watson = 2.019; Model SVA: Durbin-Watson = 1.970.
Back to article page