TABLE 3.

Subgroup analysis of the association between total oxidative balance score and gallstone.

Subgroup	N (%)	OR (95%CI)	p value	p for interaction
Age (year)				0.338
≤40	1,529 (34.94)	0.95 (0.91–0.99)	0.022
40–60	1,531 (34.99)	0.96 (0.92–0.98)	0.010
>60	1,316 (30.07)	0.99 (0.96–1.02)	0.471
Gender				0.650
male	2,201 (50.30)	0.97 (0.93–1.00)	0.086
female	2,175 (49.70)	0.96 (0.94–0.99)	0.002
Race				0.516
Mexican American	500 (11.43)	0.97 (0.91–1.04)	0.408
Non-Hispanic White	1,698 (38.80)	0.98 (0.95–1.01)	0.245
Non-Hispanic Black	1,045 (23.88)	0.97 (0.92–1.01)	0.149
Other	1,133 (25.89)	0.94 (0.91–0.98)	0.004
Education level, n (%)				0.415
Below high school	628 (14.35)	0.95 (0.90–1.00)	0.070
High school	1,011 (23.10)	1.00 (0.96–1.04)	0.983
High school above	2,737 (62.55)	0.96 (0.93–0.98)	<0.001
PIR group, n (%)				0.675
≤1.3	1,129 (25.80)	0.96 (0.92–1.00)	0.056
1.3–3.5	1,646 (37.61)	0.98 (0.94–1.01)	0.129
>3.5	1,601 (36.59)	0.96 (0.93–0.99)	0.014
Marital status, n (%)				0.055
Married/Living with Partner	2,630 (60.10)	0.97 (0.94–0.99)	0.011
Widowed/Divorced/Separated	891 (20.36)	0.96 (0.92–1.00)	0.069
Never married	855 (19.54)	0.96 (0.91–1.02)	0.165
Asthma				0.611
Yes	684 (15.63)	0.94 (0.90–0.99)	0.025
No	3,692 (84.37)	0.97 (0.95–0.99)	0.005
CHD				0.114
Yes	176 (4.02)	0.92 (0.85–1.01)	0.067
No	4,200 (95.98)	0.97 (0.95–0.99)	0.003
Hypertension, n (%)				0.665
Yes	1,534 (35.05)	0.97 (0.94–1.00)	0.044
No	2,842 (64.95)	0.96 (0.94–0.99)	0.008
Diabetes, n (%)				0.147
Yes	785 (17.94)	0.97 (0.93–1.02)	0.221
No	3,591 (82.06)	0.96 (0.94–0.99)	0.001

Gender; age; race; marriage; education, energy; PIR; cholesterol; asthma; CHD; hypertension and diabetes were adjusted.