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This study evaluates and compares the psychometric properties of the three self-report measures of alexithymia - a hypothetical personality construct thought to be associated with hypochondriasis, somatization disorder and a variety of other medical and psychiatric disorders. Two hundred and nine college students were administered the Schalling-Sifneos Personality Scale (SSPS), MMPI alexithymia scale (MMPI-A), Toronto Alexithymia Scale (TAS), and two measures of functional somatic symptoms. Results indicated that the TAS is internally consistent and sensitive to reports of somatic symptoms. In contrast, the SSPS and MMPI-A were found to have response and/or gender biases, poor internal reliabilities, and no systematic relationship with somatic symptoms. In addition, factor analysis showed the TAS to have a stable, replicable factor structure, while the SSPS demonstrated little factor stability. These findings suggest that the TAS is the most psychometrically sound measure of the alexithymia construct.
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