Ueno A, Kawamura T, Ogawa A, Takayasu H
Urology. 1977 Dec;10(6):544-6. doi: 10.1016/0090-4295(77)90097-8.
A statistical analysis of 520 ureteral calculi was undertaken to elucidate the correlation between sizes of calculi and the probability of spontaneous passage. The mean length and width of 286 calculi passed spontaneously were 6.3 +/- 2.5 (S.D.) and 4.0 +/- 1.5 mm., respectively; those of 219 calculi removed surgically were 11.7 +/- 5.0 and 7.1 +/- 2.8 mm., respectively, the difference between the two groups being statistically significant. The rate of spontaneous passage of stones within one year after diagnosis was analyzed in relation to sizes of stones which were grouped at successive 1-mm. intervals both in length and width, the over-all rate of spontaneous passage being 53 per cent. It was concluded that stones larger than 8 mm. in width on x-ray films should be removed surgically, while in those smaller than 8 mm. in width higher chances of spontaneous passage by expectant treatment would be anticipated.
对520例输尿管结石进行了统计分析，以阐明结石大小与自然排出可能性之间的相关性。286例自然排出结石的平均长度和宽度分别为6.3±2.5（标准差）和4.0±1.5毫米；219例手术取出结石的平均长度和宽度分别为11.7±5.0和7.1±2.8毫米，两组之间的差异具有统计学意义。分析了诊断后一年内结石的自然排出率与结石大小的关系，结石按长度和宽度连续1毫米的间隔分组，总体自然排出率为53%。得出结论，X线片上宽度大于8毫米的结石应手术取出，而宽度小于8毫米的结石，期待疗法自然排出的可能性较高。
