The inconsistencies of the FFM findings for the MCMI-III are consistent with a meta-analysis of the convergent validity of assessments of this particular PD. Widiger and Coker (2002) reported personality disorder convergent validity coefficients provided in 41 studies. The median convergent validity among the self-report inventories was generally good across nine of the ten personality disorders, ranging in value from .51 (paranoid) to .75 (avoidant). The one exception occurred for OCPD, which obtained a median convergent validity coefficient of -.12. However, this was largely due to the MCMI-III. The median convergent validity for the MCMI-III was -.28, whereas the median value between any other two OCPD self-report measures was .51. Nonetheless, it will be important for future studies to investigate the differences among the available assessments of OCPD, particularly the MCMI-III and SNAP, to further clarify how they relate to one another and to the domain and facets of conscientiousness.
