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Table 2 Relation between density of the stone in HU, size of the stone, and its PKUB findings

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

  PKUB findings P value
Dense opaque Opaque Faint opaque Lucent
HU
 Mean ± SD 1195.3 ± 146.8 868.1 ± 149.4 527.8 ± 138.5 443.8 ± 99.3 0.001**
 Median 1195 885 500 400
Size
 Mean ± SD 2.9 ± 1.3 2.8 ± 1.2 3.2 ± 1.4 2.6 ± 1.1 0.711
 Median 2.5 2.6 3 3
  1. **Statistically significant difference (P level < 0.01)