Sutor D J, Wooley S E
Br J Urol. 1975 Apr;47(2):131-5. doi: 10.1111/j.1464-410x.1975.tb03933.x.
Out of a group of 979 patients with urinary calculi, 175 had passed their stone(s). Comparison of data for stones which had been passed with data for the whole group shows many significant differences. Calculi composed entirely of calcium oxalate are more likely to be expelled than any other composition variety. The chance of this happening is 1 in 3 and it is even higher when the person is under 50 years of age. The probability of calculi composed of calcium oxalate+calcium phosphate being expelled is 1 in 5 and this also increases for younger patients. Infection stones consisting of calcium phosphate+struvite have only 1 in 19 chance of being passed. Many of the stones passed (130) are under 0.10 g in weight. However, there is a similar relationshp between composition and weight among both the stones that were passed and the whole group. In both groups, pure oxalate stones are the lightest, infection stones are the heaviest and stones composed of calcium phosphate and calcium phosphate+calcium oxalate are of intermediate weight.
在979例尿路结石患者中，有175例排出了结石。已排出结石的数据与整个群体的数据比较显示出许多显著差异。完全由草酸钙组成的结石比其他任何成分类型的结石更有可能被排出。发生这种情况的几率是三分之一，当患者年龄在50岁以下时，几率甚至更高。由草酸钙+磷酸钙组成的结石被排出的概率是五分之一，对于年轻患者来说，这个概率也会增加。由磷酸钙+鸟粪石组成的感染性结石只有十九分之一的排出几率。许多排出的结石（130例）重量在0.10克以下。然而，在排出的结石和整个群体中，成分与重量之间存在类似的关系。在两组中，纯草酸盐结石最轻，感染性结石最重，由磷酸钙和磷酸钙+草酸钙组成的结石重量居中。
