Figure 2.

Diagram of the age-partialed bivariate change score model for FA and RD, with parameter estimates for each model indicated as subscripts. Covariances between baseline WM and memory latent factors were estimated, as were covariances between baseline factors and change. Regressions on baseline Age were specified for the following factors: baseline WM and Memory, WM change, and Memory change. Indicator level variables (see Figure 1) are omitted for model simplicity.