Table 3.

Subgroup analyses of the association between quartiles of riboflavin intake and CVD mortality.

	Quartiles of Riboflavin Intake
Factors	Q1	Q2	Q3	Q4		p
Age (years)						0.268
20–39	1.00	0.28 (0.03–2.52)	0.10 (0.01–1.16)	0.16 (0.04–0.56)	0.008
40–59	1.00	0.51 (0.14–1.84)	0.35 (0.08–1.53)	0.31 (0.05–1.82)	0.206
60+	1.00	1.08 (0.73–1.59)	1.02 (0.64–1.63)	0.66 (0.39–1.11)	0.142
Gender						0.185
Men	1.00	1.21 (0.62–2.34)	0.75 (0.37–1.53)	0.61 (0.30–1.23)	0.055
Women	1.00	0.80 (0.46–1.39)	1.01 (0.47–2.18)	0.43 (0.15–1.20)	0.351
Race						0.290
NH White	1.00	0.92 (0.55–1.54)	0.73 (0.43–1.23)	0.44 (0.23–0.82)	0.008
NH Black	1.00	0.55 (0.28–1.10)	0.91 (0.41–2.02)	0.90 (0.40–2.03)	0.866
Mex American	1.00	1.32 (0.33–5.28)	0.97 (0.19–5.06)	1.13 (0.29–4.40)	0.923
Other race/ethn	1.00	0.71 (0.19–2.73)	0.55 (0.12–2.43)	0.62 (0.09–4.01)	0.582
Smoking						0.541
Never	1.00	0.89 (0.54–1.49)	0.76 (0.38–1.56)	0.48 (0.21–1.08)	0.108
Former	1.00	1.14 (0.57–2.25)	1.04 (0.47–2.34)	0.65 (0.28–1.55)	0.314
Current smoker	1.00	0.64 (0.19–2.09)	0.66 (0.19–2.31)	0.48 (0.13–1.81)	0.312
Alcohol drinking						0.849
No	1.00	0.93 (0.49–1.78)	0.77 (0.30–1.95)	0.60 (0.23–1.57)	0.308
Yes	1.00	0.90 (0.49–1.67)	0.65 (0.36–1.18)	0.39 (0.18–0.84)	0.009
Missing	1.00	0.86 (0.33–2.25)	1.29 (0.40–4.19)	1.19 (0.24–5.95)	0.722
Dietary folate intake (DFE, quartiles)						0.045
Q1–Q2	1.00	0.95 (0.59–1.53)	1.22 (0.65–2.28)	0.69 (0.30–1.56)	0.940
Q3–Q4	1.00	0.48 (0.21–1.09)	0.26 (0.11–0.66)	0.20 (0.08–0.50)	0.003

Model adjusted for age, gender, race, physical activity, education, smoking, alcohol drinking, and intake of energy and fat. Stratification variables were not adjusted in the corresponding model. p value from Cox regression analysis of interaction term of the listed variable and riboflavin.