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Levels of apathy across participant groups.
Differences in global apathy (A) and three apathy domains (B) between controls, premanifest, and manifest Huntington's disease gene-expansion carriers, shown as mean ± standard error of the mean. Global apathy is measured by the short-form Lille Apathy Rating Scale (LARS-s; range -15 to +15), where larger and more positive scores indicate more severe apathy. *P-value < .05, **P-value < .01 after controlling for multiple comparisons.
