Integrating oddity traits in a dimensional model for personality pathology precursors.

Current dimensional measures of early personality pathology (e.g., the Dimensional Personality Symptom Item Pool, DIPSI; De Clercq, De Fruyt, Van Leeuwen, & Mervielde, 2006) describe personality difficulties within a 4-dimensional framework. The present study corroborates recent evidence on the relevance of including a 5th Oddity-related domain for a more comprehensive description of personality pathology, and presents the construction of an empirically based taxonomy of early Oddity features. Psychometric and factor analytic procedures were conducted on self- and maternal ratings of adolescents (N = 434), resulting in 4 internally consistent facets that empirically collapse in 1 higher-order "Oddity" factor. From a structural perspective, this Oddity factor emerged as a clear 5th factor beyond the earlier proposed 4-dimensional structure of child and adolescent personality pathology. Significant associations of Oddity with both general and maladaptive trait equivalents support the construct validity of this 5th factor, and challenge current hypotheses on the applicability of the continuity hypothesis on general and maladaptive trait variance within the openness field. The results further suggest that Oddity traits are meaningfully associated with general psychopathology at a young age. These findings are discussed in terms of the importance of including a 5th Oddity-related factor in dimensional models of developmental personality pathology in order to acquire a more comprehensive description of the building blocks that underlie early personality difficulties.