TABLE 4.

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

Subgroup	N (%)	OR (95%CI)	p value	p for interaction
Age (year)				<0.001
≤40	1,529 (34.94)	0.75 (0.62–0.91)	0.003
40–60	1,531 (34.99)	0.80 (0.69–0.91)	0.001
>60	1,316 (30.07)	0.99 (0.88–1.12)	0.869
Gender				0.856
male	2,201 (50.30)	0.85 (0.74–0.98)	0.023
female	2,175 (49.70)	0.86 (0.78–0.95)	0.003
Race				0.202
Mexican American	500 (11.43)	0.78 (0.61–1.00)	0.047
Non-Hispanic White	1,698 (38.80)	0.92 (0.82–1.04)	0.195
Non-Hispanic Black	1,045 (23.88)	0.82 (0.67–1.00)	0.048
Other	1,133 (25.89)	0.86 (0.73–1.01)	0.069
Education level, n (%)				0.207
Below high school	628 (14.35)	0.81 (0.64–1.01)	0.061
High school	1,011 (23.10)	0.90 (0.77–1.06)	0.219
High school above	2,737 (62.55)	0.86 (0.78–0.95)	0.004
PIR group, n (%)				0.707
≤1.3	1,129 (25.80)	0.91 (0.77–1.07)	0.249
1.3–3.5	1,646 (37.61)	0.87 (0.76–0.99)	0.031
>3.5	1,601 (36.59)	0.84 (0.73–0.96)	0.012
Marital status, n (%)				0.013
Married/Living with Partner	2,630 (60.10)	0.89 (0.80–0.98)	0.022
Widowed/Divorced/Separated	891 (20.36)	0.90 (0.77–1.05)	0.178
Never married	855 (19.54)	0.71 (0.56–0.90)	0.005
Asthma				<0.001
Yes	684 (15.63)	0.69 (0.57–0.84)	<0.001
No	3,692 (84.37)	0.91 (0.84–1.00)	0.051
CHD				0.623
Yes	176 (4.02)	0.87 (0.63–1.19)	0.372
No	4,200 (95.98)	0.87 (0.80–0.94)	<0.001
Hypertension, n (%)				0.163
Yes	1,534 (35.05)	0.85 (0.75–0.95)	0.006
No	2,842 (64.95)	0.89 (0.79–0.99)	0.033
Diabetes, n (%)				0.077
Yes	785 (17.94)	0.87 (0.74–1.03)	0.101
No	3,591 (82.06)	0.87 (0.79–0.95)	0.003

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