Table 2 Cohort demographics

Patient Characteristics

 Female, n (%)

80 (57%)

JIA Subtype Groups

 Systemic, n (%)

5 (4%)

 Oligo-arthritis (persistent, extended, not specified), n (%)

57 (41%)

 Polyarticular arthritis, n (%)

45 (32%)

 Enthesitis-related arthritis, n (%)

24 (17%)

 Other (psoriatic, undifferentiated, unknown), n (%)

9 (6%)

Clinical Characteristics

 Age at diagnosis (years)^a

11 (6, 14), [1, 18]

 Time between first PR^b visit and diagnosis date (days)^a

36 (0, 103), [-10, 596]

 Symptom onset^c (months)^a

4 (2, 13), [0, 137]

 Follow-up period^d (years)^a

3 (2, 3), [0, 4]