Table 2.
Mean age (years ± SD) at the first stone episode according to the stone composition
| Main component | Males | Females | All | P value M vs F |
|||
|---|---|---|---|---|---|---|---|
| N | Age | N | Age | N | Age | ||
| Dihydroxyadenine | 15 | 7.2 ± 9.3 | 6 | 29.0 ± 17.3 | 21 | 15.7 ± 16.6 | < 0.01 |
| Cystine | 43 | 26.5 ± 20.1 | 51 | 27.7 ± 16.3 | 94 | 27.1 ± 18.2 | NS |
| Octacalcium phosphate pentahydrate | 16 | 25.6 ± 18.4 | 18 | 31.0 ± 13.2 | 34 | 28.6 ± 15.9 | NS |
| Whitlockite | 21 | 25.1 ± 19.2 | 22 | 37.4 ± 16.3 | 43 | 31.4 ± 18.4 | <0.05 |
| Ammonium hydrogen urate | 48 | 25.4 ± 27.1 | 35 | 43.7 ± 19.8 | 83 | 33.1 ± 26.1 | < 0.001 |
| Weddellite (COD)* | 3440 | 41.0 ± 14.0 | 1039 | 39.7 ± 16.1 | 4469 | 40.7 ± 14.6 | < 0.05 |
| Brushite | 162 | 42.8 ± 16.8 | 59 | 38.2 ± 16.2 | 221 | 41.6 ± 16.9 | NS |
| Carbapatite | 1064 | 39.4 ± 22.9 | 1702 | 43.1 ± 16.9 | 2766 | 41.7 ± 19.6 | < 0.001 |
| Amorphous carbonated calcium phosphate | 17 | 37.7 ± 30.1 | 29 | 44.4 ± 25.1 | 46 | 41.9 ± 27.1 | NS |
| Struvite | 157 | 44.2 ± 26.5 | 205 | 47.2 ± 21.3 | 362 | 45.9 ± 23.7 | NS |
| Whewellite (COM)* | 7890 | 48.8 ± 14.4 | 3383 | 47,4 ± 16.5 | 11273 | 48.4 ± 15.1 | < 0.01 |
| Uric acid dihydrate | 192 | 58.3 ± 12.9 | 40 | 62.9 ± 14.0 | 232 | 59.1 ± 13.3 | NS |
| Uric acid anhydrous | 1080 | 62.8 ± 14.6 | 366 | 61.8 ± 15.1 | 1446 | 62.5 ± 14.9 | NS |
*
COM = calcium oxalate monohydrate – COD = calcium oxalate dihydrate