males at the age of 25 onwards. Particularly in the case
of males, this trend was continuous (Fig. 2). The
comparison of the age distributions of stone patients
in the years 2001 and 1979 clearly reveals that the
increase in prevalence is primarily attributable to the
higher age groups (>50) (Fig. 3).
Over 40% of respondents stated that they had suffered
from urolithiasis a number of times (Table 2).
Over 10% had had five or more stone episodes.
3.2. Incidence
1.47% of respondents had had urinary calculi in the
year 2000 (Table 3). 50% of these were first occurrences,
and 50% were recurrences. The incidence was