[The Pathological Buying Screener: Validation in a Clinical Sample].

Aim: The aim of the study was to evaluate the psychometric properties of the 13-item Pathological Buying Screener (PBS, [1]) in a clinical sample.

Method: The PBS was administered to a total sample of 413 treatment-seeking patients (buying-shopping disorder n=151, gambling disorder n=59, alcohol dependency n=60, other mental disorders [anxiety, depressive, eating, somatoform disorders] n=143). Factor structure was tested in the total sample using confirmatory factor analysis (CFA), reliability was determined by means of Cronbach's α. Group comparisons were used to determine to which degree the PBS discriminates between patients with BSD and other clinical groups. The BSD-group completed a battery of other measures to explore convergent and divergent validity. A subgroup (n=29) answered the PBS before and after psychotherapy to investigate sensitivity to change. A receiver operating characteristic (ROC) curve analysis with PBS data of patients with buying-shopping disorder and those from a previous community sample 1 was performed to define a cut-off point for buying-shopping disorder.

Results: The CFA showed a good model fit for both a one-factor and a two-factor structure with the subscales "loss of control/consequences" (10 items) and "excessive buying behavior" (3 items). The subscales were highly intercorrelated (r=0.92). A hierarchical regression analysis with another BSD measure as dependent variable did not indicate an own incremental validity of the subscale "excessive buying behavior". Good convergent, divergent and discriminative capacity was obtained for the PBS total score. At its recommended cut-off point of ≥29 the PBS has a sensitivity of 98% and a specificity of 94.7%.

Conclusion: The findings indicate good psychometric properties of the PBS and suggest that the PBS total score can be used in clinical settings.