Table 1

Characteristics of patients in the cohort by juvenile idiopathic arthritis category*

 CharacteristicAllSystemic arthritisOligoarthritisRF-negative polyarthritisRF-positive polyarthritisPsoriatic arthritisEnthesitis-related arthritisUndifferentiated
Number of patients1104764162354664157110
% Female64.047.469.576.995.566.126.567.9
Age at diagnosis in years9.3 (3.9–13.0)6.9 (3.3–12.3)6.4 (2.9–11.4)8.8 (3.4–12.5)13.2 (10–15.3)11.3 (4.9–13.6)13.1 (10.8–14.5)9.7 (3.6–13.2)
Disease duration at diagnosis in months4.3 (2.1–9.0)1.7 (0.9–2.9)4.1 (2.1–7.4)4.9 (2.3–11.9)4.8 (2.0–7.6)5.5 (2.0–11.6)7.1 (3.3–14.1)4.2 (2.4–8.8)
Time from diagnosis to enrolment in months0.3 (0–1.6)1.0 (0.5–2.1)0.2 (0–1.4)0.2 (0–1.4)1.2 (0–2.3)0.3 (0–2.2)0.0 (0–2.1)0.1 (0–1.8)
Follow-up in months34.2 (21.5–48.0)40.1 (23.7–49.7)33.5 (21.0–48.0)35.9 (23.8–50.6)31.1 (19.8–43.6)33.5 (17.6–49.0)27.8 (18.2–38.2)31.1 (21.9–47.7)
Active joint count at enrolment3 (1–7)2 (1–6)2 (1–2)9 (5–18)12 (5–23)6 (1–13)3 (1–6)2 (1–6)
PGA at enrolment in mm30 (17–52)38 (14–63)23 (12–36)47 (29–67)52 (26–71)35 (18–60)30 (17–48)27 (18–50)
ESR at enrolment in mm/h †18 (7–36)58 (25–89)17 (8–31)18 (8–37)36 (17–55)17 (9–44)9 (3–23)17 (5–35)
  • *All numbers are median and (25–75 centiles) unless otherwise specified.

  • †ESR was obtained in 90% of the cohort at enrolment.