CRP and Sacroiliac arthritis: In the univariate logistic regression model, the ASDAS inactive disease category was significantly associated with being male (OR 1.99, p = 0.03), age (OR 0.97, p = 0.022), NSAIDs (OR 0.22, p < 0.001), smoking (OR 0.40, p = 0.008), the BASDAI (OR 0.22, p < 0.001), the BASFI (OR 0.26, p < 0.001), CRP (OR 0.70, p = 0.031), and sacroiliitis (OR 3.41, p = 0.047).