Stone Composition as a Function of Age and Sex

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Figure 1.
Association of sex with stone type.
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Figure 2.
Association of age with stone type.
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Figure 3.
Combined association of age and sex with stone type. (A) Men and (B) women are depicted separately.
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Figure 4.
Association of calendar month with stone numbers submitted. Submissions by month are depicted for four major stone types: (A) calcium oxalate, (B) uric acid, (C) struvite, and (D) apatite. *P<0.001 for evidence of seasonality for a given stone type using a chi-squared test with 11 degrees of freedom.

Table 1.

Distribution of stone type analyzed during calendar year 2010 (n=43,545)

Table 2.

Stones submitted for analysis by age and sex

Age (yr)	Men	Percent	Women	Percent	Ratio of Men to Women Stone Formers
0–9	73	0.3	60	0.3	1.22 (1.05)^a
10–19	396	1.6	675	3.7	0.59^b (1.04)^a
20–29	1588	6.3	2548	13.9	0.62^b (1.03)^a
30–39	3229	12.8	3331	18.1	0.97 (0.99)^a
40–49	4884	19.4	3369	18.4	1.45^b (0.97)^a
50–59	6160	24.5	3724	20.3	1.65^b (0.95)^a
60–69	5300	21.0	2765	15.1	1.92^b (0.89)^a
70–79	2653	10.5	1267	6.9	2.09^b (0.78)^a
80–89	846	3.4	552	3.0	1.53^b (0.63)^a
90+	62	0.2	63	0.3	0.98^b (0.63)^a
Total	25,191	100.0	18,354	100.0	1.37^b (0.97)^a

↵a Values represent the men-to-women ratio for each age group in the 2010 United States census (age 80 and above combined).
↵b P<0.05 for comparison of the sex ratio of stones submitted versus the sex ratio in the 2010 United States census.