A sample of 314 patients with XYY would be 'best hospitalised due to an increased likelihood of aggressive behaviour'. The request for hospitalisation was based upon common knowledge of traits associated with each of the sexes.
Theilgaard (1984)
Researched the personality traits of a sample of XXY men and compared these to a sample of XY men and men with XXY. Part of the research compared the aggressiveness of the XYY to XY men. Theilgaard's background research showed that about 1 in 1000 males are XYY and that no single characteristic except height has been associated with XYY. Aggression levels fluctuate.
Also used the Rorschach test, in which XYY males gave more aggressive interpretations than XY counterparts.
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