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. 2020 Aug 29;33(6):1577–1584. doi: 10.1007/s40520-020-01683-0

Fig. 1.

Fig. 1

The model used to examine the mediation effect of WMH load on hand motor scores. Here, a is the correlation between age and WMH load, b the relation between WMH load and hand motor score, ab the indirect effect, c is the total effect, and c′ the direct effect of age on motor score