CRP and spondylitis: Male AS patients tend to have disease onset at younger age and present with higher CRP, more back pain, knee involvement, higher scores for BASRI (including BASRI-spinal and BASRI-hip), radiographic sacroilitis, higher modified Stoke Ankylosing Spondylitis Spinal Score, lower functional indices (occiput-to-wall and finger-to-floor distances), but higher SF-36 mental and physical scores.