Fig. 3

HHcy prevalence 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). Significant differences in HHcy prevalence are found in any two groups (P < 0.01) except that there are no statistical differences between 16 and 29 and 50–59, 16–29 and 60–69, and 30–39 and 40–49 age groups in males (P > 0.05). Whereas in females, except that no statistical differences are observed between 16 and 29 and 30–39, 16–29 and 40–49, 16–29 and 50–59, and 30–39 and 40–49 age groups (P > 0.05), significant differences exist between any other two groups (P < 0.05 between 70 and 79 and ≥ 80, P < 0.01 between any other pairs). HHcy, hyperhomocysteinemia