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Table 2 The interreader reproducibility analysis of MSU crystal volume and its correlation with the serum uric acid

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

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
  1. Values are given as the mean ± standard deviation (mean ± SD)
  2. MSU monosodium urate, ICC intraclass correlation coefficient values, 95% CI 95% confidence interval, r, Spearman rank correlation coefficient, NA not available
  3. #Spearman correlation analysis between serum uric acid and the average volume of MSU crystals