Table 1

Baseline characteristics of children with and without available items for the Juvenile Arthritis Disease Activity Score (JADAS)

CovariateWhole cohortCohort with JADASCohort without JADASp ValueCohort with JADAS3Cohort without JADAS3p Value
N956352604551405
Age at onset (years)6.6 (2.6–10.6)6.7 (2.7–10.8)6.4 (2.6–10.6)0.496.6 (2.7–10.6)6.4 (2.5–10.6)0.82
Female (%)6566640.5464650.75
Caucasian (%)9091900.7391900.45
Disease duration (months)5.5 (2.9–11.8)5.5 (2.7–11.8)5.5 (2.9–12.1)0.605.6 (2.8–12.6)5.4 (2.9–10.6)0.51
ILAR category
 Systemic57 (6)28 (8)29 (5)0.1231 (6)26 (6)0.2
 Persistent oligoarthritis484 (51)164 (47)320 (53)274 (50)210 (52)
 Extended oligoarthritis23 (2)13 (4)10 (2)18 (3)5 (1)
 RF− polyarthritis175 (18)67 (19)108 (18)103 (19)72 (18)
 RF+ polyarthritis30 (3)11 (3)19 (3)14 (2)16 (4)
 Enthesitis related54 (6)16 (4)38 (6)37 (7)17 (4)
 Psoriatic67 (7)28 (8)39 (6)40 (7)27 (7)
 Undifferentiated66 (7)25 (7)41 (7)34 (6)32 (8)
Active joint count2 (1–5)2 (1–6)2 (1–4)0.122 (1–5)2 (1–5)0.79
Limited joint count1 (1–3)1 (1–4)1 (1–3)0.011 (1–4)1 (1–3)0.07
Physician global2.9 (1.5–5)3.3 (1.9–5.8)2.5 (1.5–4.6)0.00013 (1.8–5.4)2.5 (1.4–4.6)0.001
Parent global2.1 (0.5–5)2.3 (0.6–5)1.9 (0.3–5)0.182.1 (0.5–5)2.1 (0.3–5)0.73
ESR20 (6–49)21 (7–50)16 (5–49)0.1021 (7–50)16 (5–49)0.10
Pain (median, IQR)30 (8–58)33 (9–62)27 (7–50)0.0730 (8–57)30 (7–59)0.7
CHAQ0.6 (0.1–1.4)0.8 (0.3–1.4)0.6 (0.1–1.4)0.060.6 (0.1–1.4)0.6 (0.1–1.4)0.36
  • Values are median (IQR) or number (%).

  • CHAQ, Childhood Health Assessment Questionnaire; ESR, erythrocyte sedimentation rate; ILAR, International League Against Rheumatism; RF, rheumatoid factor.