Clinical features of children with enthesitis-related juvenile idiopathic arthritis / juvenile spondyloarthritis followed in a French tertiary care pediatric rheumatology centre

Table 1 Baseline characteristics

	Total, n = 114
Sex ratio (boys/girls)	1.7
Age at 1st symptoms, median (IQR)	9.55 (2.7)
Disease duration at the 1st visit, median (IQR)	1.2^* (2)
HLA-B27	49 (43%)
Familial history of SPA 1^er degree	32 (28%)
Familial history of psoriasis 1^er degree	17 (15%)
Familial history of inflammatory bowel disease	12 (10%)
Axial involvement	40 (35%)
Inflammatory back pain	23 (20%)
Sacroiliitis	33 (29%)
Peripheral arthritis	44^** (2%)
Oligo-articular involvement	30 (56%)
Poly-articular involvement	14 (26%)
Enthesitis	39 (72%)

CI confidence interval, SpA Spondylarthritis, IQR interquartile range
Axial involvement was defined as 1) inflammatory low-back pain or inflammatory dorsal pain lasting for more than one month; 2) limited spine mobility, defined by a Schober index < 10 + 4 cm; 3), sacroiliac pain at examination or alternating buttock pain; or 4) presence of axial disease by imagery. Sacroiliitis was defined as 1) sacroiliac pain at examination or alternating buttock pain; or 2) presence of sacroiliitis by either MRI or standard radiography
^* There was a significant difference between boys and girls (1.5 years vs. 2.3 years respectively, p = 0.04)
^** Peripheral arthritis was more frequent in boys than girls (87 vs. 67% respectively, p = 0.03)

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