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Mediating effect of BDNF within model, as a function of age. Note: Moderated mediation conditional indirect effect. Values of the y-axis are the unstandardized mediating effects (coefficients) of BDNF on the relationship between exercise group and task switch accuracy cost. Bars indicate age quintiles (10th, 25th, 50th, 75th, and 90th percentiles) on the x-axis. Sample distribution is as follows: Age <60: n = 13; 61–63: n = 21; 64–65; n = 12; 66–71: n = 23; 71–76: n = 16; >77: n = 7.
