aLikelihood ratio testing was applied in nested Tobit models to assess the incremental value of sacroiliitis in predicting aortic vascular inflammation. The outcome variable was aortic maximum standardized uptake (SUVmax). Independent variables in the different models were as follows: psoriatic arthritis (unadjusted); age, sex, BMI and psoriatic arthritis (partially adjusted); and age, sex, BMI, hypertension, dyslipidemia, diabetes, tobacco use and psoriatic arthritis (fully adjusted). χ2 values are reported for each model. P-values < 0.05 were considered significant.