Figure 4

Positive association between plasma total antioxidant capacity (TAC) and (A) plasma α-carotene (B) plasma β-carotene. (A) A significant positive association exists between plasma α-carotene and plasma TAC (P = 0.01, R² = 0.14, n = 33). Comparisons were made using multiple linear regression controlling for age and gender. (B) A significant positive association exists between plasma β-carotene and plasma TAC (P < 0.001, R² = 0.32, n = 33). Comparisons were made using multiple linear regression controlling for age and gender.