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. Author manuscript; available in PMC: 2008 Jan 1.
Published in final edited form as: Am J Clin Nutr. 2007 Jan;85(1):193–200. doi: 10.1093/ajcn/85.1.193

FIGURE 1.

FIGURE 1

Association between serum vitamin B-12 and serum folate in senior participants in the National Health and Nutrition Examination Survey (1999–2002) who had no evidence of renal dysfunction or history of stroke, alcoholism, recent anemia therapy, or diseases of the liver, thyroid, or coronary arteries (n = 1457). Points represent least-squares geometric means adjusted for age, sex, race-ethnicity, education, cancer, smoking, alcohol intake, and serum concentrations of ferritin and creatinine for supplement users and nonusers combined. Error bars represent 95% CIs. Quartile categories 1, 2, 3, and 4 are <271, 271–366, 367–484, and >484 pmol/L for supplement users and <208, 208–281, 282–350, and >350 pmol/L for nonusers, respectively. The direct association between serum vitamin B-12 and serum folate (Ptrend < 0.001) did not vary with supplement use (Pinteraction < 0.751).