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Table 3 Comparison of MSU crystal deposits at different regions and serum uric acid in patients grouped by ASDAS scores

From: Monosodium urate crystal deposition associated with the progress of radiographic grade at the sacroiliac joint in axial SpA: a dual-energy CT study

  ASDAS scores x 2 /Z/F p
  ASDAS < 1.3 (n = 38) 1.3 ≤ ASDAS < 2.1 (n = 38) 2.1 ≤ ASDAS ≤ 3.5 (n = 50) ASDAS > 3.5 (n = 60)
MSU crystallization (+/-) (n)#
 Left sacroiliac joint 8/30 6/32 16/34 27/33 11.451 0.010
 Right sacroiliac joint 3/35 4/34 11/39 36/24 43.684 <0.001
 Hip joint 15/23 16/22 22/28 22/38 0.676 0.879
 Pubic symphysis 11/27 13/25 18/32 21/39 0.549 0.908
Volume of MSU crystallization (cm3)$
 Left sacroiliac joint 0.21 ± 0.62 0.14 ± 0.47 0.49 ± 1.34 0.23 ± 0.57 9.198 0.027
 Right sacroiliac joint 0.04 ± 0.18 0.13 ± 0.52 0.35 ± 1.09 0.57 ± 1.62 34.607 <0.001
 Total volume at pelvis 2.41 ± 6.51 2.69 ± 5.04 7.40 ± 11.49 4.13 ± 7.77 10.517 0.015
Serum uric acid (μmol/L)& 321.0 ± 100.4 326.2 ± 104.2 397.9 ± 109.4 382.9 ± 99.8 6.322 <0.001
  1. Values are given as the numbers or the mean ± standard deviation (Mean±SD)
  2. ASDAS Ankylosing Spondylitis Disease Activity Score, MSU monosodium urate
  3. #Pearson chi-square (x 2) test
  4. $Kruskal-Wallis rank-sum test
  5. &One-way analysis of variance (ANOVA)
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