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Table 2 Clinical course of the disease in relation with age-group.

From: Dietary habits in women with recurrent idiopathic calcium nephrolithiasis

  Age groups
  < 30 years
(mean age 24 ± 5)
n. 29
31-40 years
(mean age 37 ± 3)
n. 38
> 41 years
(mean age 53 ± 7)
n. 76
STONE RATE
number of stones per patient per year#
1,2 ± 1, 2* 0,7 ± 0,8 0,4 ± 0,5
AGE AT 1 st EPISODE
(years)
21 ± 6* 30 ± 8 42 ± 15
INTERVAL BETWEEN 1ST AND 2ND EPISODE
(years)
2,4 ± 2,2* 5 ± 5,8 7,5 ± 8,4
  1. - Data are shown as mean ± standard deviation.
  2. * = p < 0.01 vs other groups.
  3. #Stone rate was calculated following the formula (total n. of stones - n. of stone at 1st episode/time between 1st and last episode).