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Box-plots showing stratification by APOE status of (standardized) MCI's index and cognitive scores. Standardized values were calculated by computing z-scores from average data. Average data = (data at baseline + data at 1-year)/2. e4+, APOE e4 carrier; e4−, APOE e4 non-carrier; MCI, mild cognitive impairment; MMSE, Mini Mental State Examination; CDR-sum, clinical dementia rating sum of boxes; ADAS1, Alzheimer Disease assessment scale.
