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BACKGROUND AND OBJECTIVES: Kidney stones are heterogeneous but often grouped together. The potential effects of patient demographics and calendar month (season) on stone composition are not widely appreciated. DESIGN, SETTING, PARTICIPANTS, P<0.001), whereas the season did not influence other stone types. CONCLUSIONS: It is well known that calcium oxalate stones are the most common stone type. However, age and sex have a marked influence on the type of stone formed. The higher number of stones submitted by women compared with men between the ages of 10 and 29 years old and the change in composition among the elderly favoring uric acid have not been widely appreciated. These data also suggest increases in stone risk during the summer, although this is restricted to calcium oxalate and uric acid stones.
Lieske et al. (Fri,) studied this question.
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