Associations between the cerebral blood flow and executive function
To assess dose–response and possible nonlinearity, we plotted bivariate associations of executive function and CBF using generalized additive models with the penalized spline. The results showed that the association of the accuracy of TMT with PI, RI, and S/D was approximately linear, while the time of TMT and CBF index were non-linear. (Fig. The dose–response associations between the executive function and CBF. 