Table 3

Biological characteristics of children with SA, JIA and arthritis with no definitive diagnosis at onset

VariableAccording to groupTotal
Group 1: SA (n=63)Group 2: No definitive diagnosis*
(n=45)
Group 3: JIA (n=17)p ValueTotal (n=125)
CRP (mg/L)
 Median (min–max)39 (5–246)33 (5–205)35 (5–134)0.1436 (5–246)
  IQR21–7612–5022–7020–69
 Missing valueN=0N=1N=1N=1
Fibrinogen (g/L)
 Median (min–max)5.73 (3.52–8.44)5.04 (2.92–10.3)5.61 (3.10–11.49)0.035.52 (2.92–11.49)
 IQR5.04–6.814.28–6.004.90–6.104.74–6.48
 Missing valueN=7N=3N=2N=12
WBC counts (×109/L)
 Median (min–max)12.1 (7.8–30.7)11.9 (6.1–22.6)11.7 (7.5–21.0)0.5311.9 (6.1–30.7)
 IQR9.8–15.58.8–14.710.0–15.09.7–15.0
 Missing valueN=3N=2N=0
Neutrophil counts (×109/L)
 Median (min–max)5.9 (2.0–22.7)6.5 (1.7–16.6)7.1 (4.1–15.3)0.536.5 (1.7–22.7)
 IQR4.0–9.54.0–8.85.4–10.24.3–9.5
 Missing valueN=28N=19N=4N=51
Haemoglobin (g/dL)
 Median (min–max)11.5 (9.9–14.4)11.6 (9.4–13.5)11.0 (9.5–13.2)0.1911.6 (9.4–14.4)
 IQR10.9–12.110.8–12.310.6–11.710.8–12.2
 Missing valueN=9N=3N=0N=12
Platelets (×109/L)
 Median (min–max)346 (163–702)356 (154–560)460 (288–591)0.01360 (154–702)
 IQR284–421262–409364–522284–457
 Missing valueN=7N=3N=2N=12
Synovial WBC counts (×°103cells/mm3)
 Median (min–max)147 (10–2790)10 (0–1000)51 (6–1110)<0.00171 (0–2790)
 IQR71–2271–5912–11311–209
 Missing valueN=34N=23N=9N=66
Synovial WBC counts >50×103cells/mm3, % (n)86.2 (25)31.6 (6)50.0 (4)<0.00159.3 (35)
  • Arthritis with no definitive diagnosis: Arthritis that did not fulfil the criteria for SA, JIA or other well established diagnoses.

  • CRP, C reactive protein; JIA, juvenile idiopathic arthritis; SA, septic arthritis; WBC, white blood cell.