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69 men in introductory psychology took Barron's ego strength scale, Spielberger's trait anger scale, and the Buss-Durkee hostility inventory. Low ego strength was associated with getting angry easily (r = -.32), responding to others in a hostile manner (Buss-Durkee motor factor r = -.30), and harboring hostile attitudes (Buss-Durkee attitude factor r = -.55). These data support the idea that the scale measures a broad capacity for personality integration, including the control of anger and hostility.
Schill et al. (Mon,) studied this question.