Table 5. Relationship between serum bilirubin and estimated glomerular filtration rate within selected subgroups.

Characteristics	N	β (P-value)	P-value	P-interaction
Gender
Men	413	0.11	0.008	0.778
Women	637	0.10	0.001
Age
<80 years	415	0.13	0.002	0.605
≥80 years	635	0.10	0.001
Medication
Absence	390	0.15	<0.001	0.463
Presence	660	0.08	0.005
Cardiovascular disease
Absence	590	0.07	0.034	0.080
Presence	460	0.14	<0.001

β, standardized coefficient. Medication included antihypertensive, antidyslipidemic, and antidiabetic medications. §Adjusted for all confounding factors in Table 3 by multiple linear regression analysis (Forced method).