Table 1 Clinical characteristics of children with septic arthritis, juvenile idiopathic arthritis and arthritis with no definitive diagnosis.

From: Acute monoarthritis in young children: comparing the characteristics of patients with juvenile idiopathic arthritis versus septic and undifferentiated arthritis

 

According to group

JIA (N = 20)

SA (N = 110)

UA (N = 66)

p-value

Age at diagnosis (years), median (IQR)

2.7 [1.8–3.6]

1.4 [1.1–2.1]

2.4 [1.5–4.0]

< 0.001

Male, % (n)

40.0 (8)

51.8 (57)

62.1 (41)

0.17

Onset in autumn or winter, %(n)

45.0 (9)

50.9 (56)

37.9 (25)

0.24

Affected joints, % (n)

Knee

70.0 (14)

52.7 (58)

42.4 (28)

0.01

Hip

25.0 (5)

20.0 (22)

42.4 (28)

 

Ankle

5.0 (1)

10.0 (11)

4.6 (3)

 

Other joints

0.0 (0)

17.3 (19)

10.6 (7)

 

Fever prior to admission or at admission, % (n/N)

58.3 (7/12)

79.4 (50/63)

75.6 (31/41)

0.30

  1. SA septic arthritis, JIA juvenile idiopathic arthritis, UA undetermined arthritisa, IQR interquartile range.
  2. aArthritis with no established association with infection that did not fulfil the classification criteria for JIA or other well-established diagnoses.
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