For each patient the following variables were collected: age, sex, age at onset, family history, arthritis type, involved joints, JADAS-27 score, presence of enthesitis, tenosynovitis, uveitis, IS, erythrocyte sedimentation rate (ESR), C-reactive protein, immunoglobulins, anti-nucleus antibody and rheumatoid factor levels. Here, CRP is linked to arthritic joint disease.