Demographics and characteristic of ERA at onset.

All values are mean (SD), unless specified otherwise. CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; PGA, physician’s global assessment; VAS, visual analog scale; CHAQ, Childhood Health Assessment Questionnaire; ERA, enthesitis-related arthritis; LOM, limitation of motion. †mean (standard deviation), between-group comparison: Student’s t-test. ‡frequency/total, n (%), between-group comparisons: chi-square test. §frequency/total, n (%), between-group comparisons: continuity correction. *p<0.05 denotes a significant difference between different groups. Demographics and characteristic of ERA at onset.