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Table 1 Patient demographics of unmatched PJK and Non-PJK group

From: Paraspinal muscle degeneration and lower bone mineral density as predictors of proximal junctional kyphosis in elderly patients with degenerative spinal diseases: a propensity score matched case–control analysis

 

PJK

Non-PJK

P-Values

Number of patients

108

225

 

Age (yrs.)

74.0 ± 6.0

70.6 ± 4.2

 < 0.001

Female

74

145

0.463

History of smoking

18

28

0.296

BMI

27.58 ± 3.72

25.73 ± 3.53

 < 0.001

Levels fused

4.3 ± 1.7

3.8 ± 1.3

0.007

UIV

Thoracic

34

52

 

Lumbar

74

173

0.102

  1. BMI body mass index, UIV upper instrumented vertebra. All values are expressed as mean value ± standard deviation