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Table 1 Demographic and disease related variables

From: Aerobic capacity and disease activity in children, adolescents and young adults with juvenile idiopathic arthritis (JIA)

N = number of patients Age 10–13 yrs Age 14–17 yrs Age 18–27 yrs All patients
  N = 33 N = 18 N = 12 N = 63
Boys (N) 13 6 3 22
Girls (N) 20 12 9 41
Subtype JIA N (%) 3 (9.1) 4 (22.2) 1 (8.3) 8 (12.7)
Systemic 3 (9.1) 0 (0) 0(0) 3 (4.8)
Oligo persistent 9 (27.3) 3 (16.7) 3 (25.0) 15 (23.8)
Oligo extended 3 (9.1) 2 (11.1) 2 (16.7 ) 7 (11.1)
Polyarticular RF+ 14 (42.4) 8 (44.4) 5 (41.7) 27 (42.9)
Polyarticular RF- 0 (0) 1 (5.6) 1 (8.3) 2 (3.2)
Enthesitis related Psoriatic arthritis 1 (3.0) 0 (0) 0 (0) 1 (1.6)
Disease Duration in years (IQR) 5.5 (6.0) 10.5 (6.0) 10.0 (18.0) 8.0 (7.0)
CHAQ (IQR) 1,6 (0.8) 1,4 (0.3) 1,4 (0.6)_ 1,5 (0.8)
Sports performance (hours/week, IOR) 2.0 (3.0) 3.0 (8.0) 2.5 (6.0) 2.0 (3.0)
BMI kg/m2 (IQR) 17.9 (3.3) 21.3 (4.5) 19.8 (3.9) 18.8 (4.7)
Z-score VO2peak (IQR) −0.9 (1.5) −0.8 (1.6) −0.6 (1.7) −0.8 (1.3)**
Z-score VO2peak/kg (IQR) −1.6 (1.7) −1.5 (2.1) −1.0 (2.1) −1.5 (1.9)**
ESR mm (IQR) 8.0 (10.0) 9.5 (16.0) 7.0 (14.0) 8.0 (13.0)
CRP mg/l (IQR) 2.0 (5.0) 6.0 (23.0) 6.0 (5.0) 5.5 (6.0)
Haemoglobin mmol/l (IQR) 8.0 (1.0) 7.6 (1.0) 8.7 (1.3) 7.9 (1.3)
Thrombocytes 10.9/l (IQR) 315 (102) 273 (102) 290 (93) 298 (83)
DAS28 (IQR) 1.7 (1.1) 1.8 (1.9) 1.5 (1.6) 1.6 (1.2)
JADAS 27 (IQR) 3.6 (7.1) 3.0 (22.9) 2.6 (17.1) 2.9 (9.0)
VAS patient (IQR) 0.2 (2.3) 0.5 (3.1) 0.5 (.6) 0.5 (2.3)
Number of swollen joints (IQR) 0.0 (2.0) 0.0 (3.0) 0.0 (3.0) 0.0 (4.4)
Number of tender joints (IQR) 0.0 (3.5) 0.0 (4.0) 0.0 (3.8) 0.0 (4.1)
Number of limited joints (IQR) 1.5 (4.0) 2.0 (5.0) 2.5 (5.0) 2.0 (4.0)
  1. All variables are expressed as median values unless otherwise stated.
  2. ** p < 0.01 significant difference compared to healthy age and sex related individuals.