Table 1

 Demographic and clinical characteristics of patients with juvenile idiopathic arthritis

VariableDisease activity at follow upp Value
Inactive (n = 46)Active (n = 77)
DMARD, disease modifying antirheumatic drug; ESR, erythrocyte sedimentation rate; IQR, interquartile range; RF, rheumatoid factor; VAS, visual analogue scale.
Demographic
Female (n (%))28 (61)61 (79)0.028
Age at onset (years) (mean (SD))8.3 (4.4)7.5 (4.4)0.39
Clinical
Diagnosis (course type) (n (%))0.062
    Oligoarthritis33 (72)45 (58)
    Extended oligoarthritis1 (2)14 (18)
    Polyarthritis, RF negative10 (22)13 (17)
    Polyarthritis, RF positive1 (2)3 (4)
    Systemic arthritis1 (2)1 (1)
    Psoriatic arthritis0 (0)1 (1)
Time from diagnosis to follow up (years) (mean (range))15.6 (6.6 to 23.6)16.5 (6.0 to 23.8)0.34
Age at follow up (years) (mean (range))23.4 (21 to 26)23.3 (21 to 26)0.85
Patients receiving DMARDs (n (%))3 (7)68 (88)<0.001
Measures of disease activity at follow up
ESR (mm/h) (median (IQR))4 (3 to 9)9 (5 to 16)<0.001
Duration of morning stiffness (min) (median (IQR))0 (0 to 0)0 (0 to 30)<0.001
Number of swollen joints (median (IQR))0 (0 to 0)1 (0 to 3)<0.001
Number of tender joints (median (IQR))0 (0 to 0)1 (1 to 3)<0.001
Patient’s global assessment (VAS) (median (IQR))1 (0 to 2)10 (1 to 25)<0.001
Physician’s global assessment (VAS) (median (IQR))0 (0 to 1)12 (3 to 23)<0.001
Pain (VAS) (median (IQR))0 (0 to 1)5 (0 to 25)<0.001
RAND-36
Physical health summary scores (mean (SD))53.9 (4.9)47.6 (9.3)<0.001
Mental health summary scores (mean (SD))50.0 (9.2)50.0 (8.3)0.99