Fig. 3

Multivariate logistic regression analyses of predictors of progression of ≥ 2 modified Stoke Ankylosing Spondylitis Spine Score (mSASSS) units over 5 years. ORs reflect a change in one unit for continuous variables. Normal body mass index (BMI) = reference. Exposure data are number of patients exposed or median (interquartile range). Significant ORs are shown in bold typeface. Variables included for total group: BMI categories, exposure to bisphosphonates, sex, baseline C-reactive protein (CRP), history of uveitis, age, ever-smoker, baseline mSASSS and Bath Ankylosing Spondylitis Functional Index (BASFI), for men: BMI categories, ever-smoker, baseline CRP, age, history of uveitis and baseline mSASSS, for women: exposure to bisphosphonates, baseline mSASSS, baseline CRP, age, BMI categories and BASMI. CI, confidence interval; OR, odds ratio