Assessing the dimensionality of scores derived from the Revised Formal Thought Disorder Self-Report Scale in schizotypy

Philip J Sumner, Denny Meyer, Sean P Carruthers, Fakir M Amirul Islam and Susan L Rossell

PLOS ONE, 2022, vol. 17, issue 12, 1-25

Abstract: The current work explored the dimensionality and convergent validity of responses to Barrera et al.’s (2015) 29-item Formal Thought Disorder–Self Scale (FTD-SS) obtained in two non-clinical samples. Exploratory factor analyses were conducted in Sample 1 (n = 324), yielding evidence of three correlated factors, although simple structure was not achieved until nine items were removed. Support for the correlated three factors model of responses to the revised 20-item scale (FTD-SS-R) was replicated when a confirmatory factor analysis was conducted in Sample 2 (n = 610). Finally, convergent associations were found between FTD-SS-R scores and scores from other schizotypy measures across both samples, though these measures only explained half of the variance in FTD-SS-R scores. Additional research is needed to evaluate the appropriateness of the items and incremental validity of the scale in non-clinical samples.

Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0278841

DOI: 10.1371/journal.pone.0278841

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