Table 1 Characteristics of patients by JIA categorya
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 |