Table 4 Comparison of predictive value and real value in validation group (n = 30).

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

Parameters

Real value

Predictive value

Difference

P value

95%CI

lower

upper

SS (°)

18.3 ± 8.9

17.0 ± 7.5

1.3 ± 7. 7

0.367

 − 1.58

4.15

PT (°)

25.8 ± 9.9

27.0 ± 7.8

1.2 ± 7.7

0.397

 − 4.08

1.67

TPA (°)

26.8 ± 9.6

25.7 ± 10.5

1.1 ± 4.8

0.233

 − 0.72

2.86

SVA (mm)

87.9 ± 61.5

79.3 ± 41.6

8.6 ± 48.6

0.337

 − 9.37

26.52

  1. Real value was measured on the radiographs, predictive value was calculated using the prediction formulae.
  2. SS sacral slope, PT pelvic tilt, TPA T1 pelvic angel, SVA sagittal vertical axis, CI confidence interval.
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