Table 3.
Comparison of MSU crystal deposits at different regions and serum uric acid in patients grouped by ASDAS scores
| 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 |
Values are given as the numbers or the mean ± standard deviation (Mean±SD)
ASDAS Ankylosing Spondylitis Disease Activity Score, MSU monosodium urate
#Pearson chi-square (x 2) test
$Kruskal-Wallis rank-sum test
&One-way analysis of variance (ANOVA)