Fig. 2

Mean Hcy levels in different age groups (16–29, 30–39, 40–49, 50–59, 60–69, 70–79, and ≥ 80 years of age) in males (a) and females (b). Error bar stands for standard error. Significant differences are found between 16 and 29 and 30–39 (P < 0.01), 16–29 and 40–49 (P < 0.01), 16–29 and 50–59 (P < 0.01), 16–29 and 60–69 (P < 0.01), 16–29 and 70–79 (P < 0.05), 30–39 and 70–79 (P < 0.01), 30–39 and ≥ 80 (P < 0.01), 40–49 and 60–69 (P < 0.05), 40–49 and 70–79 (P < 0.01), 40–49 and ≥ 80 (P < 0.01), 50–59 and 70–79 (P < 0.01), 50–59 and ≥ 80 (P < 0.01), 60–69 and 70–79 (P < 0.05), and 60–69 and ≥ 80 (P < 0.01) age groups in males (a). However, in females, significant differences exist in any two groups (P < 0.01) except that there are no statistical differences between 16 and 29 and 40–49, and 70–79 and ≥ 80 age groups (P > 0.05) (b). Hcy, homocysteine