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24. Associations of the Multidimensional Schizotypy Scale-Brief with Interview Measures of Symptoms and Impairment
The present study employed structured diagnostic interviews to assess the construct validity of a brief version of the Multidimensional Schizotypy Scale (MSS-B), which was developed to assess positive, negative, and disorganized dimensions of schizotypy. It was hypothesized that the MSS-B schizotypy subscales would be associated with differential patterns of symptoms and impairment, comparable to findings for the full-length MSS. A total of 177 young adults completed the MSS-B and structured diagnostic interviews assessing symptoms and impairment. As hypothesized, positive schizotypy was significantly associated with interview ratings of positive (psychotic-like) symptoms, as well as schizotypal and paranoid personality traits. Negative schizotypy was associated with interview ratings of negative symptoms, as well as schizoid, paranoid, and schizotypal traits. Furthermore, negative schizotypy predicted diagnoses of Cluster A personality disorders. Disorganized schizotypy was associated with interview ratings of disorganized symptoms. All three schizotypy dimensions were associated with impaired functioning. The present study was the first to evaluate the validity of the MSS-B using interview measures. The findings indicate that the MSS-B schizotypy subscales are uniquely associated with hypothesized patterns of symptoms and impairment, and the pattern of findings for each subscale of the MSS-B was largely comparable to the associations with the full-length MSS.