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Boxplots for the composite scores (y axis) of the five defined language domains in the three groups. Units in the y axis correspond to added values of variables of each domain after being divided by the total number of words in the individuals' speech and by their standard deviation calculated from the control sample. Significant differences between pairs of groups as given by the Tukey's HSD test are also shown (*: p < .05, **: p < .01, ***p < .001). Pre-HD: pre-symptomatic patients.
