Comparisons of stone anatomical localisation in patients with different stone compositions
| Variable | Overall, n=858 | Bladder stone, n=25 | Urethra stones, n=18 | Kidney stone, n=207 | Ureter stone, n=608 | P value |
| CaOx | 686 (80.0) | 13 (52.0) | 12 (66.7) | 164 (79.2) | 497 (81.7) | 0.003 |
| COD | 156 (18.2) | 4 (16.0) | 4 (22.2) | 24 (11.6) | 124 (20.4) | 0.027 |
| COM | 530 (61.8) | 9 (36.0) | 8 (44.4) | 140 (67.6) | 373 (61.3) | 0.006 |
| CA | 79 (9.2) | 1 (4.0) | 2 (11.1) | 17 (8.2) | 59 (9.7) | 0.757 |
| UA | 42 (4.9) | 10 (40.0) | 2 (11.1) | 9 (4.4) | 21 (3.5) | <0.001 |
| Mixed | 42 (4.9) | 0 (0) | 2 (11.1) | 13 (6.3) | 27 (4.4) | 0.224 |
| MAP | 7 (0.8) | 1 (4.0) | 0 (0) | 3 (1.5) | 3 (0.5) | 0.117 |
| SA | 1 (0.1) | 0 (0) | 0 (0) | 0 (0) | 1 (0.2) | >0.999 |
| Brushite | 1 (0.1) | 0 (0) | 0 (0) | 1 (0.5) | 0 (0) | 0.291 |
Note: n (%); P value was calculated by Fisher’s exact test or Pearson’s χ2 test.
CaOx was categorised as either CaOx dihydrate (COD) or CaOx monohydrate (COM).
CA, carbonate apatite; CaOx, calcium oxalate; MAP, magnesium ammonium phosphate; SA, sodium acid urate monohydrate; UA, uric acid.