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Fasting plasma total homocysteine concentration by quartiles of the homocysteine score in the testing set (n = 628) and in the NHS II (n = 596). Values are means. The homocysteine score was calculated by the linear combination of the homocysteine determinants weighted by the β coefficient between each determinant and plasma homocysteine in Table 3. HCY, homocysteine; NHS, Nurses’ Health Study.
