Table 2 Associations between clinical variables and total thoracic syndesmophtes volume

Sex

4.83(-4.91, 8.63)

0.63

Age, years

0.11(0.02, 0.41)

0.02*

0.28(-0.89, 0.32)

0.35

Disease duration, years

0.43(0.15, 0.77)

0.04*

0.43(-0.28, 1.14)

0.23

Inflammatory back pain

-0.88(-7.11, 5.34)

0.78

Ever Achilles enthesitis

-1.63(-3.51, 1.63)

0.86

Ever peripheral arthritis

1.51(0.29, 2.74)

0.04*

0.28(-0.31, 2.22)

0.56

Ever uveitis

0.72(-9.31, 2.36)

0.86

Ever ulcerative colitis

0.32(-2.13, 2.19)

0.98

Current smoker

1.23(-0.76, 2.53)

0.06

1.33(0.97, 5.65)

0.04*

BMI, kg/m²

0.96 (0.58, 2.49)

0.02*

1.18(0.31, 2.69)

0.01*

CRP, mg/dl

0.31(-1.34, 1.96)

0.71

ESR, mm/h

-0.02(-0.24, 0.19)

0.82

HLA-B27 positive

-0.85(-2.51, 2.82)

0.94