The Development of the Five-Factor Schizoid Inventory

Area of Science:

• Psychology
• Personality Disorders
• Psychometrics

Background:

• Schizoid personality disorder (SZD PD) traits require reliable measurement tools.
• The Five-Factor Model (FFM) provides a robust framework for understanding personality.

Purpose of the Study:

• To develop and validate the Five-Factor Schizoid Inventory (FFZI).
• To assess the FFZI's reliability and validity in measuring SZD PD traits within the FFM framework.

Main Methods:

• Study 1: Developed and validated the FFZI using self-report measures in undergraduate participants (n=496).
• Study 2: Assessed FFZI reliability and validity in an online community sample (n=181) via MTurk.
• Utilized internal consistency, convergent, and discriminant validity analyses.

Main Results:

• The FFZI demonstrated excellent internal consistency and convergent validity with SZD PD measures.
• Discriminant validity was established against other personality disorders and non-hypothesized IPIP-NEO facets.
• Preliminary support for FFZI reliability and validity was found in an online sample.

Conclusions:

• The FFZI is a psychometrically sound measure for assessing schizoid personality disorder traits.
• Findings support the conceptualization of SZD PD as a maladaptive facet of introversion within the FFM.