Table 1.
Overall accuracy of micro CT analysis used by itself to identify majority mineral among 757 urinary stone specimens.
| Major mineral | Number | Sensitivity | Specificity |
|---|---|---|---|
| Calcium oxalate | 458 | 99.6% | 95.3% |
| Apatite | 114 | 88.5% | 99.2% |
| Brushite | 58 | 89.7% | 99.6% |
| Uric acid | 56 | 96.4% | 99.4% |
| Struvite | 49 | 93.9% | 99.6% |
| Cystine | 11 | 90.9% | 99.6% |
| Ammonium acid urate | 3 | 0 | 99.6% |
| 1-methyl uric acid | 1 | 0 | 100% |
| Sodium acid urate | 1 | 0 | 100% |
| Mixed urates | 1 | 0 | 100% |
| Calcium tartrate tetrahydrate | 1 | 0 | 100% |
| Dihydroxyadenine | 1 | 0 | 100% |
| Matrix stone | 1 | 0 | 100% |
| Octacalcium phosphate | 1 | 0 | 100% |
| Whitlockite | 1 | 0 | 100% |
Sensitivity is calculated as the number of correct identifications divided by the total number of specimens of that majority mineral (as verified by spectroscopic analysis). Specificity is the proportion of specimens correctly identified as not being composed of that majority mineral; less than 100% specificity indicates that there was at least one specimen that was incorrectly identified as being composed of that majority mineral.