Sociodemographic characteristics of patients stratified by different stone composition groups
| Variable | Overall, n=858 | CaOx, n=686 | Infection stones, n=86 | UA, n=42 | Others, n=44 | P value |
| Age (years) | 42.0 (33.0, 53.8) | 42.0 (35.0, 54.0) | 35.0 (30.0, 44.8) | 57.0 (49.5, 66.0) | 37.5 (31.0, 48.5) | <0.001 |
| Age group | <0.001 | |||||
| 18–39 | 377 (43.9) | 293 (42.7) | 53 (61.6) | 6 (14.3) | 25 (56.8) | |
| 40–59 | 347 (40.4) | 285 (41.5) | 28 (32.6) | 19 (45.2) | 15 (34.1) | |
| ≧60 | 134 (15.6) | 108 (15.7) | 5 (5.8) | 17 (40.5) | 4 (9.1) | |
| Gender | 0.029 | |||||
| Female | 189 (22.0) | 139 (20.3) | 25 (29.1) | 9 (21.4) | 16 (36.4) | |
| Male | 669 (78.0) | 547 (79.7) | 61 (70.9) | 33 (78.6) | 28 (63.6) | |
| Stone anatomical location | <0.001 | |||||
| Upper urinary tract | 815 (95.0) | 661 (96.4) | 82 (95.3) | 30 (71.4) | 42 (95.5) | |
| Lower urinary tract | 43 (5.0) | 25 (3.6) | 4 (4.7) | 12 (28.6) | 2 (4.6) | |
| Stone constitutes | <0.001 | |||||
| 1 | 424 (49.4) | 374 (54.5) | 19 (22.1) | 29 (69.0) | 2 (4.6) | |
| 2 | 326 (38.0) | 270 (39.4) | 40 (46.5) | 13 (31.0) | 3 (6.8) | |
| ≥3 | 108 (12.6) | 42 (6.12) | 27 (31.4) | 0 (0) | 39 (88.6) |
Note: n (%); P value was calculated by the Kruskal-Wallis rank sum test or Fisher’s exact test or Pearson’s χ2 test.
Others refer to the mixed stone, SA and brushite.
CaOx, calcium oxalate; SA, sodium acid urate monohydrate; UA, uric acid.