Fig. 3

Associations between log-transformed total carotene, α-carotene, β-carotene, β-cryptoxanthin and lutein/zeaxanthin with biological aging indices were evaluated by RCS. The adjustments involved the covariables selected in the model 4 of multiple linear regression model. The pink dotted lines indicate the median, the solid blue lines correspond to the central estimates, and the bluish-shaded regions indicate the 95% confidence intervals