inflammatory marker Article 1 Bath ankylosing spondylitis disease activity index 1 C reactive protein 1 Comorbidity 1 adult 1 ankylosing spondylitis 1 clinical aging 1 clinical feature 1 controlled study 1 disease activity 1 erythrocyte sedimentation rate 1 female 1 human 1 inflammatory response 1 interleukin-10 1 interleukin-6 1 major clinical study 1 male 1 multiple chronic conditions 1 musculoskeletal disease assessment 1 receiver operating characteristic 1 retrospective study 1 risk factor 1 sensitivity and specificity 1 systemic immune inflammation index 1 systemic immune-inflammation index 1 tumor necrosis factor-α 1