Development of a Short Form of the Personality Styles and Disorder Inventory (PSDI-6).

The original Personality Styles and Disorder Inventory (PSDI) consists of 140 items capturing the non-pathological equivalents of 14 personality disorders (PDs) listed in DSM-II1-R, DSM-IV-TR. and ICD-10. Because the DSM-5 proposes only six PDs in its research section and completing the PSDI is very time-consuming, a questionnaire capturing these six PDs with a smaller number of items would be desirable. Therefore, the short version PSDI-6 measuring each of the six PDs with six items was developed. Methods: Items were selected by means of exploratory and confirmatory factor analysis (CFA), using a calibration sample of nonclinical pregnant women. Measurement invariance of the PSDI-6 was demonstrated by CFA of multisample models in two independent samples. The PSDI-6 demonstrated acceptable internal consistency, factorial validity, and factorial invariance. Correlations with perfectionism, anxiety, and depression provided preliminary evidence of convergent and discriminant validity. Because our sample was limited to pregnant women, further studies should investigate the PSDI-6 in other clinical contexts. [ABSTRACT FROM AUTHOR]