A predominant finding of the studies included within this meta-analysis was a positive correlation of FFM conscientiousness facets with OCPD. However, even here the results can be said to be instrument specific, as the finding was confined largely to studies that administered the MCMI-III or the SNAP. Consistent with the earlier meta-analysis of Saulsman and Page (2004), the predominant measure of personality disorder being used in this research has been the MCMI-III (Millon et al., 1996), yet the predominant research finding from this instrument might not itself be reliable. It is perhaps worth questioning the result even though it was consistent with theoretical expectations (Widiger, Trull, et al., 2002) since the findings for the MCMI-III were so strikingly different from those obtained from the PDQ and SCID-II (e.g., negative rather than positive correlations with FFM neuroticism). Nonetheless, the fact that the SNAP also obtains positive relationships with neuroticism (consistent with the PDQ and SCID-II), but also confirms the positive relationships with conscientiousness indicates that this finding for the MCMI-III may be robust.
