. 2014 Oct 2;9(12):2141–2146. doi: 10.2215/CJN.05660614

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

Values represent the men-to-women ratio for each age group in the 2010 United States census (age 80 and above combined).

P<0.05 for comparison of the sex ratio of stones submitted versus the sex ratio in the 2010 United States census.