Table 2.

Age and multivariate adjusted relative risks for incident kidney stones by type of menopause (1991–2013)

	Pre-menopause	Post-Menopause, Natural	Post-menopause, Surgical
Cases	2,415	577	425
Person-years	1,304,561	347,252	184,207
Age-adjusted RR	1.0 (ref)	1.12 (0.97, 1.28)	1.51 (1.34 to 1.71)
MV-adjusted RR	1.0 (ref)	1.27 (1.09 to 1.48)	1.43 (1.19 to 1.73)

Multivariate Model: Adjusted for age, body mass index, race, dietary factors (calcium, magnesium, potassium, sodium, animal protein, oxalate, vitamin D, vitamin C, alcohol, total fluid), supplemental calcium intake, thiazide, history of hypertension, history of diabetes mellitus, post-menopausal hormone therapy

^*Abbreviations: MV, multivariate; RR, relative risk

^**Type of menopause for remaining 39 cases was radiation induced menopause