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The Standardized Assessment of Personality (SAP) involves a short semi-structured interview with an informant. It was modified to accord with the 1987 draft of the tenth revision of the International Classification of Diseases (ICD-10) and used to assess the pre-morbid personality of first-admission patients in one London area over the period of one year. Of the 120 (84% of the total sample of first-admissions) patients included, 43 (36%) were found to satisfy the ICD-10 criteria for personality disorder and a further 17 (14%) to satisfy the criteria for personality trait accentuation.
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Pilgrim et al. (1990) studied this question.
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