Table 2.
The interreader reproducibility analysis of MSU crystal volume and its correlation with the serum uric acid
| Joint | Reader | Volume of MSU crystallization (cm3) | Intraclass correlation coefficient | Correlation with serum uric acid# | ||||
|---|---|---|---|---|---|---|---|---|
| Mean ± SD | 95% CI | ICC | 95% CI | p | r | p | ||
| Left sacroiliac joint (n = 57) | Reader 1 | 0.900 ± 1.351 | 0.541–1.258 | 0.999 | 0.998-0.999 | <0.001 | NA | NA |
| Reader 2 | 0.904 ± 1.340 | 0.549–1.260 | NA | NA | ||||
| Average | 0.902 ± 1.345 | 0.545–1.259 | NA | NA | NA | 0.727 | <0.001 | |
| Right sacroiliac joint (n = 54) | Reader 1 | 1.078 ± 1.878 | 0.578–1.619 | 1.000 | 0.999-1.000 | <0.001 | NA | NA |
| Reader 2 | 1.071 ± 1.878 | 0.5700–1.612 | NA | NA | ||||
| Average | 1.074 ± 1.878 | 0.574–1.616 | NA | NA | NA | 0.740 | <0.001 | |
| Pelvis (n = 154) | Reader 1 | 5.237 ± 8.942 | 3.813–6.660 | 0.999 | 0.999-0.999 | <0.001 | NA | NA |
| Reader 2 | 5.307 ± 9.150 | 3.850–6.764 | NA | NA | ||||
| Average | 5.272 ± 9.044 | 3.832–6.712 | NA | NA | NA | 0.896 | <0.001 | |
Values are given as the mean ± standard deviation (mean ± SD)
MSU monosodium urate, ICC intraclass correlation coefficient values, 95% CI 95% confidence interval, r, Spearman rank correlation coefficient, NA not available
#Spearman correlation analysis between serum uric acid and the average volume of MSU crystals