* Radiographic record of unilateral; Data were presented as mean ± standard deviation, median (lower quantile, upper quantile) or number (percent). ASDAS: Ankylosing Spondylitis Disease Activity Score; BASDAI: Bath Ankylosing Spondylitis Disease Activity Index; BASFI: Bath Ankylosing Spondylitis Functional Index; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; HLA: human leukocyte antigen; M/F: male/female; NSAIDs: non-steroidal anti-inflammatory drugs; SASP: sulfasalazine; TNFi: tumor necrosis factor inhibitor.
Table 2 Detailed methylation status of the 31 CpG sites of AS patients and HCs