Investigating the M-FAST: psychometric properties and utility to detect diagnostic specific malingering |
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Authors: | Guy Laura S Kwartner Phylissa P Miller Holly A |
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Affiliation: | Department of Psychology, Simon Fraser University, 8888 University, Drive, Burnaby, British Columbia, V5A 1S6 Canada. lguy@sfu.ca |
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Abstract: | This study examined the ability of the M-FAST to differentiate a group of undergraduate students simulating one of four DSM-IV diagnoses (n = 190; schizophrenia, major depressive disorder, bipolar disorder, and posttraumatic stress disorder) and a clinical comparison sample drawn from previous M-FAST studies comprising individuals with the same diagnosis (n = 142). Across all diagnostic conditions, the simulators obtained higher M-FAST total scores than the clinical comparisons, and the rare combinations scale was equal or superior to the total score at differentiating the groups. The M-FAST was most efficient at distinguishing feigned from bona fide schizophrenia. Although the internal consistency of the total score was high (alpha = 0.88), inter-item correlations were lower than values reported in previous research. Lastly, given the importance of base rate considerations in the evaluation of diagnostic instruments, it was notable that the M-FAST was able to identify malingerers even at relatively low base rates. |
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