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Predicted rates of cognitive change based on baseline characterization of bicaudate ratio. For graphical presentation, baseline bicaudate ratio is presented as a dichotomous variable based on the median split of the entire sample (median=0.1567). Note that higher bicaudate ratio indicates greater amounts of atrophy. The results from the GEE analysis suggest that the greater the amount of atrophy at baseline, the greater the rate of cognitive decline.
