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Original Research Communication |
1 From the Departments of Consumer and Family Studies/Dietetics (VG) and Mathematics (MRK), San Francisco State University, San Francisco, CA.
Background: Elevated serum total homocysteine (tHcy) is an independent risk factor for vascular diseases.
Objective: Associations between serum tHcy and demographics, health and lifestyle factors, and blood vitamin concentrations were investigated.
Design: Data from the third National Health and Nutrition Examination Survey, 19881994 were used to examine associations in men (n = 2965) and women (n = 3580) between tHcy and age, sex, race-ethnicity, body mass index, systolic and diastolic blood pressures, alcohol consumption, supplement use, red blood cell (RBC) folate, and serum creatinine, folate, vitamin B-12, and cotinine (a measure of cigarette smoking).
Results: The unadjusted mean tHcy was 21.5% (
1.9 µmol/L) higher in men than in women, 11.8% (
1.1 µmol/L) higher in non-Hispanic whites than in Mexican Americans, 42% (
3.7 µmol/L) higher in persons aged
70 y than in persons aged < 30 y, and 10.9% (
1.0 µmol/L) higher in supplement nonusers than in supplement users. The tHcy concentration was negatively associated with serum folate (P < 0.0001 for trend), RBC folate (P < 0.0001 for trend), and serum vitamin B-12 (P < 0.0036 for trend) and was positively associated with alcohol consumption (P < 0.0001 for trend), serum cotinine (P < 0.0001 for trend), and systolic blood pressure (P < 0.0001 for trend). Consumption of hard liquor (but not of beer or wine) was positively associated with tHcy concentration (P < 0.0001 for trend).
Conclusions: In this population-based study, the significant predictors of tHcy concentration were sex, age, race-ethnicity, serum creatinine, systolic blood pressure, body mass index, hard-liquor consumption, smoking, supplement use, serum folate, RBC folate, and serum vitamin B-12.
Key Words: Homocysteine third National Health and Nutrition Examination Survey NHANES III folate red blood cell folate vitamin B-12 creatinine smoking alcohol consumption cotinine age race ethnicity supplements blood pressure body mass index heart disease coronary artery disease cardiovascular disease vascular disease
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