Supplementary Table 2.

Association of dietary niacin intake and erectile dysfunction risk after propensity score matching

Variable	Model 1		Model 2		Model 3		Model 4
	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P	OR (95% CI)	P
Dietary niacin	0.98 (0.97–0.99)	0.003	0.98 (0.97–1.00)	0.01	0.98 (0.97–1.00)	0.01	0.98 (0.97–1.00)	0.02
Stratified by dietary niacin quartiles
Tertile 1	1		1		1		1
Tertile 2	0.85 (0.58–1.24)	0.38	0.81 (0.56–1.20)	0.28	0.82 (0.55–1.23)	0.31	0.82 (0.53–1.27)	0.31
Tertile 3	0.59 (0.44–0.81)	0.002	0.61 (0.44–0.83)	0.003	0.59 (0.41–0.84)	0.01	0.58 (0.39–0.86)	0.01
P for trend		0.002		0.004		0.02		0.012

Model 1: unadjusted; Model 2: adjusted for age and race, marital status, education level, PIR, and BMI categories; Model 3: adjusted for age, race, marital status, education level, PIR, BMI categories, recreational activity, smoking, drinking status, and total daily energy intake; Model 4: additionally adjusted for CVD, hypercholesterolemia, hypertension, diabetes, as well as testosterone levels. OR: odd ratio; CI: confidence interval; BMI: body mass index; PIR: poverty income ratio; CVD: cardiovascular disease