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Table 1 Characteristics of 77 patients with juvenile idiopathic arthritis (JIA), and 42 healthy children in the study

From: Haptoglobin in Juvenile Idiopathic Arthritis

 

Total cohort, for allelic frequency

Participants for paired samples

Healthy controls

Participants, n (% females)

77 (61.0)

66 (62.1)

42 (30.9)

Age at sampling (Md, IQR)

10.3 (4.7–14.4)

10.1 (5.2–14.4)

7.7 (2.7–12.2)c

Age at onset (Md, IQR)

8.5 (3.2–12.4)

8.5 (3.2–12.6)

 

ILAR category a course type, n (%)

  Oligoarticularb

38 (49.4)

32 (48.5)

 

  Polyarticular, RF-negative

16 (20.8)

14 (21.2)

 

  Polyarticular, RF-positive

3 (3.9)

3 (4.5)

 

  Enthesitis-related

10 (13.0)

7 (10.6)

 

  Psoriatic

5 (6.5)

5 (7.6)

 

  Systemic

1 (1.3)

1 (1.5)

 

  Undifferentiated

4 (5.2)

4 (6.1)

 
  1. Md Median, IQR inter-quartile range, RF rheumatoid factor
  2. aAccording to the criteria established by the International League of Associations for Rheumatology (ILAR). The classification was established at inclusion and corrected for course type at follow-up
  3. bpersistent or extended
  4. cAge at sampling in the healthy children compared to the total cohort of patients with JIA, p = N.S. Mann Whitney U test