Table 1

Sociodemographic characteristics of patients stratified by different stone composition groups

VariableOverall, n=858CaOx, n=686Infection stones, n=86UA, n=42Others, 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
 18–39377 (43.9)293 (42.7)53 (61.6)6 (14.3)25 (56.8)
 40–59347 (40.4)285 (41.5)28 (32.6)19 (45.2)15 (34.1)
 ≧60134 (15.6)108 (15.7)5 (5.8)17 (40.5)4 (9.1)
Gender 0.029
 Female189 (22.0)139 (20.3)25 (29.1)9 (21.4)16 (36.4)
 Male669 (78.0)547 (79.7)61 (70.9)33 (78.6)28 (63.6)
Stone anatomical location <0.001
 Upper urinary tract815 (95.0)661 (96.4)82 (95.3)30 (71.4)42 (95.5)
 Lower urinary tract43 (5.0)25 (3.6)4 (4.7)12 (28.6)2 (4.6)
Stone constitutes <0.001
 1424 (49.4)374 (54.5)19 (22.1)29 (69.0)2 (4.6)
 2326 (38.0)270 (39.4)40 (46.5)13 (31.0)3 (6.8)
 ≥3108 (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.