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Relationship between free testosterone level and Logical Memory Delayed Recall by APOE-ε4 status. ε4 carriers (ε4+) are represented in blue, ε4 non-carriers (ε4−) are represented in red. In ε4 carriers individuals free testosterone was positively correlated with performance (r = .20), whereas in non-carriers the correlation was not significant (r = .05).
