Objective: The aim of this study was to investigate the quality of Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition dependent personality disorder (DPD) prototype with special reference to possible bidimensionality.
Method: The sample included 1078 patients, 81% (n = 875) had 1 or more personality disorders. The proportion of patients with DPD was 11.3% (n = 122). Frequency distribution, chi2, correlations, reliability statistics, exploratory and confirmatory factor analyses were performed.
Results: Of the DPD criteria, criterion 3 showed a higher correlation with avoidant personality disorder than with DPD itself, whereas criterion 5 was weakly correlated with DPD, findings being confirmed by an exploratory factor analysis and a low internal consistency of all DPD criteria. An a priori hypothesized 2-factor model was confirmed by the confirmatory factor analysis.
Conclusions: These results indicate a moderate to low quality of the DPD construct. The main objection is that DPD is based too heavily on a bidimensional model of perceived incompetence and dysfunctional attachment. Items should be revised, in particular, items 3 and 5.