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Table 3 Relation between type of the stone and its KUB findings

From: Can stone composition be predicted by plain X-ray and/or non-contrast CT? A study validated by X-ray diffraction analysis

  Dense opaque Opaque Faint opaque Radiolucent P value
Median Median Median Median
Ca (Po4) 30.95 37.25 33.3 30.8 0.079
COM 40.3 28.2 20 20 0.003**
COD 26.8 16.7 20 20 0.122
Struvite 0 6.35 16.7 7.7 0.004**
Urate 0 0 6.7 10.5 0.001**
Cystine 0 0 0 0 0.291
  1. **Statistically significant difference (P level < 0.01)