Dietary habits in women with recurrent idiopathic calcium nephrolithiasis

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

	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

- Data are shown as mean ± standard deviation.
* = p < 0.01 vs other groups.
#Stone rate was calculated following the formula (total n. of stones - n. of stone at 1^st episode/time between 1^st and last episode).

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