Supplementary Table 3.

Sensitivity analyses 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)	0.01	0.98 (0.97–1.00)	0.02	0.99 (0.97–1.00)	0.03	0.98 (0.97–1.00)	0.02
Stratified by dietary niacin quartiles
Tertile 1	1		1		1		1
Tertile 2	0.86 (0.60–1.24)	0.41	0.86 (0.60–1.23)	0.39	0.90 (0.61–1.34)	0.58	0.87 (0.57–1.33)	0.45
Tertile 3	0.59 (0.43–0.82)	0.003	0.61 (0.43–0.86)	0.003	0.66 (0.46–0.96)	0.03	0.57 (0.37–0.89)	0.02
P for trend		0.002		0.006		0.023		0.016

Sensitivity analyses excluded participants taking medications that could affect erectile function. 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