Table 2.

O. formigenes among patients with recurrent CaOx kidney stones and control subjects according to demographic factors

Factor	Case Patients		Control Subjects		Crude OR	Multivariate OR (95% CI)a
	O. formigenes/Total	%	O. formigenes/Total	%
Age
18 to 39	13/58	22	18/61	30	0.7	0.7 (0.3 to 1.6)
40 to 49	14/74	19	28/80	35	0.4	0.4 (0.2 to 0.9)
50 to 59	9/72	13	34/71	48	0.2	0.2 (0.07 to 0.4)
60 to 69	6/43	14	19/47	40	0.2	0.2 (0.08 to 0.7)
Gender
male	27/154	18	59/158	37	0.4	0.4 (0.2 to 0.6)
female	15/93	16	40/101	40	0.3	0.3 (0.1 to 0.6)
Race/ethnicity
non-Hispanic white	37/210	18	79/215	37	0.4	0.4 (0.2 to 0.6)
other	5/37	14	20/44	46	0.2	0.1 (0.04 to 0.5)
Region
Massachusetts	35/186	19	74/193	38	0.4	0.4 (0.2 to 0.6)
North Carolina	7/61	12	25/66	38	0.2	0.2 (0.07 to 0.5)

^aOR based on unconditional logistic regression with the model for each stratum including terms for the other factors listed above (e.g., for age 18 to 39 yr, gender, race, and region were controlled).