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. 2022 Feb 9;38(1):177–183. doi: 10.1093/ndt/gfac037

Table 2.

Risk of incident kidney stones by sex overall and across categories of age

	Men	Women
Overall
Cases	2392	7910
Person-years	883 224	4 989 025
Incidence rate^a	271	159
HR (95% CI)	2.32 (2.20, 2.45)	1.00 (Ref.)
<50 years
Cases	439	3291
Person-years	113 035	1 770 286
Incidence rate^a	388	186
HR (95% CI)	2.76 (2.41, 3.15)	1.00 (Ref.)
50–54 years
Cases	382	1314
Person-years	100 845	740 903
Incidence rate^a	379	177
HR (95% CI)	2.55 (2.22, 2.91)	1.00 (Ref.)
55–59 years
Cases	438	1305
Person-years	129 679	722 061
Incidence rate^a	338	181
HR (95% CI)	2.18 (1.93, 2.47)	1.00 (Ref.)
60–64 years
Cases	439	948
Person-years	148 886	656 760
Incidence rate^a	295	144
HR (95% CI)	2.31 (2.04, 2.61)	1.00 (Ref.)
65–69 years
Cases	325	595
Person-years	140 050	484 199
Incidence rate^a	232	123
HR (95% CI)	2.02 (1.74, 2.33)	1.00 (Ref.)
≥70 years
Cases	369	457
Person-years	250 730	614 816
Incidence rate^a	147	74
HR (95% CI)	2.17 (1.87, 2.52)	1.00 (Ref.)

The estimates are age-adjusted as age is the time axis for the survival analysis. ^aNumber of events per 100 000 person-years