A clinical study was made on 103 cases of urinary calculi among the number of 464￢inpatients during 2 years and 8 months from January 1977 to August 1979, and chemicall analysis was performed on 80 cases of urinary calculi which were collected.
The results were as followings;
1. The incidence of urinary calculi was 22.2% in inpatients, and male to female ratio, was approximately 1.9 : 1, and 81. 6% of the patients of urinary calculi were distributed in 20 to 49 years old.
2. The location of urinary calculi were ureter 53. 4%, kidney 30.1 0, bladder 13.6% and urethra 2. 9%, and upper urinary tract calculi was 83. 5% and lower urinary tract calculi was 16. 5%. The most common size was 1.0-2.9cm (68. 8%), and below 0.9cnt and above 6.0cm in its diameter were 5% respectively.
3. The results of chemical analysis of 80 urinary calculi revealed oxalate salt in 72. 5%, phosphate salt in 70.0%, and single composition was 22.5%. Among the upper urinary tract calculi, oxalate salt were 60.0;0 and phosphate salt were 51. 3%, but in lower urinary tract, especially in bladder stones, ammonium salt were 83.3%.
4. The calculi which composed with ammonium salt were closely related with in￢fection than other composed calculi.
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