Table 2

Disease duration and gender are two clinical variables associated with radiographic severity in ankylosing spondylitis

 Disease durationGender (female=0; male=1)Disease duration * gender
βp Valueβp Valueβp Value
(a) Cervical mSASSS
Combined cohorts0.25 (0.16 to 0.34)2.01×10−81.54 (−1.14 to 4.21)0.260.22 (0.12 to 0.32)3.1×10−5
(b) Lumbar mSASSS
Combined cohorts0.20 (0.12 to 0.28)7×10−72.26 (−0.16 to 4.67)0.070.17 (0.08 to 0.27)2.1×10−4
(c) Total mSASSS
Combined cohorts0.45 (0.31 to 0.60)1.7×10−93.9 (−0.57 to 8.38)0.090.40 (0.22 to 0.57)7.9×10−6
  • Regression coefficients computed by taking the latest radiograph per patient unless it has the maximum score, in that case the previous radiograph is taken.

  • mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score.