CRP and rheumatoid arthritis: According to criteria of European Spondyloarthropathy Study Group in 1991 [28], a total of 44 patients finally were included (32 male, 12 female; mean age, 30.11 ± 14.66 years, range, 12–59 years; duration, 5.45 ± 5.9 years; CRP, 14.23 ± 21.39 mm/L; ESR, 24.62 ± 25.11 mm/H), and 19 patients were excluded because of unconfirmed AS, spondyloarthritis (SpA), osteoarthritis (OA), rheumatoid arthritis (RA), and scoliosis.