FIGURE 8-1 Mean plasma homocysteine (Hcy) concentrations (and 95% confidence intervals) by deciles of intake of folate. Means are adjusted for age, gender, and other vitamin intakes. Asterisk indicates significantly different from mean in the highest decile (p < 0.01). Reprinted with permission, from Selhub et al. (1993). Copyright 1993 by the American Medical Association.