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Table 1 Characteristics of patients by JIA categorya

From: Growth and weight gain in children with juvenile idiopathic arthritis: results from the ReACCh-Out cohort

Characteristic All (N = 1147) Systemic Arthritis (n = 77) Oligoarthritis (n = 443) RF-negative polyarthritis (n = 232) RF-positive polyarthritis (n = 44) Psoriatic arthritis (n = 70) Enthesitis-related Arthritis (n = 164) Undifferentiated (n = 117)
% Female 64.0 47.4 70.2 77.6 95.5 67.1 25.0 68.4
Age at diagnosis (yrs) 9.5 (4.0, 13.1) 6.6 (3.1, 12.2) 6.4 (3.0, 11.5) 9.1 (3.4, 12.7) 12.8 (9.4, 15.2) 11.6 (5.3, 13.6) 13.1 (10.8,14.5) 9.5 (3.7, 13.1)
Disease duration (months) 5.8 (3.1, 10.9) 2.9 (1.9, 5.4) 5.3 (3.0, 8.9) 6.1 (3.4, 12.4) 5.5 (3.6, 10.6) 6.5 (3.0, 13.6) 8.9 (4.2,17.3) 5.9 (3.5, 9.0)
Follow-up (months) 35.5 (23,49) 40.7 (24,52) 35.0 (23,49) 36.7 (24,52) 33.1 (23, 49) 34.5 (18, 49) 30.9 (19, 40) 35.7 (23, 48)
Height Z-score at enrolment 0.02 (−0.70, 0.82) 0.09 (−0.69, 0.91) 0.06 (−0.65, 0.83) −0.13 (−0.77, 0.58) 0.02 (−0.59, 0.69) 0.12 (−0.68, 0.99) 0.16 (−0.52, 0.98) −0.19 (−0.92, 0.62)
Weight Z-score at enrolment 0.31 (−0.37, 1.06) 0.58 (0.04, 1.25) 0.25 (−0.35, 0.90) 0.17 (−0.53, 0.94) 0.16 (−0.83, 0.94) 0.66 (−0.26, 1.4) 0.61 (−0.52, 1.4) 0.29 (−0.53, 0.96)
BMI percentile at enrolment 66 (34, 89) 80.4 (62, 90) 62.6 (35, 87) 64.6 (34, 87) 55.8 (18, 88) 75.3 (46, 96) 65.8 (28, 93) 67.0 (38, 88)
Disease activity (mm) 28 (12, 50) 37 (13, 62) 19 (8, 34) 46 (27, 66) 52 (26, 71) 23 (11, 51) 30 (12, 46) 26 (12, 48)
ESR, mm/hb 18 (7, 36) 58 (25, 89) 17 (7, 31) 18 (8, 36) 36 (16, 53) 15 (8, 36) 10 (4, 24) 16 (5, 35)
Treatments c
 DMARDs (%) 55.7 71.1 33.9 84.9 97.7 50.0 58.7 53.8
 Biologics (%) 11.7 34.2 3.6 15.9 40.9 7.1 12.2 10.3
 Corticosteroid joint injections (%) 44.3 17.1 55.5 43.5 43.2 41.4 31.4 41.9
 Systemic corticosteroids (%) 18.2 85.5 9.3 28.0 63.6 17.1 23.8 23.1
 Corticosteroids >3 months (%) 10.6 65.0 0.9 10.8 29.5 2.9 9.3 11.1
Ethnicity d
 British (%) 50.2 41.9 44.7 54.1 44.2 60.6 54.6 53.5
 French (%) 31.2 22.1 35.8 26.1 18.6 34.8 22.7 42.1
 Indigenous Canadian (%) 8.1 5.8 8.9 7.7 16.3 6.1 5.5 8.8
 Other (%) 25.4 26.7 21.8 31.5 34.9 16.7 30.7 16.7
Parental education e
 Less than high school (%) 2.01 1.6 1.9 2.9 0 1.6 2.6 1.0
 High school/some postsecondary (%) 50.24 53.1 45.8 51.7 61.9 54.1 51.6 56.4
 University/postgraduate degree (%) 47.75 45.3 51.6 46.4 38.1 44.3 45.8 42.6
Inactive disease within 1 year of diagnosis (%) 49.5 44.7 65.48 36.6 22.7 42.9 37.8 39.3
  1. aNumbers are median and (25th, 75th centiles) unless otherwise specified
  2. bESR was obtained in 88% of the cohort at enrolment
  3. cTreatments received at any time during the study
  4. dSelf-reported ethnicity was available in 96% of the cohort. Other ethnicity includes Asian, African, Latin American and other European ethnicities. The sum of ethnicities may add to more than 100% because each child could report up to 6 ethnic backgrounds
  5. eThe level of education of the parent who had a higher level of education. Parental education for at least one parent was obtained in 93% of the cohort at enrolment