While findings based on the alternative coding regarding dysfunction proposed by (Trull et al., 2010) were similar to those based on the NESARC coding, especially pertaining to the general PD factor, the lower prevalence of schizoid, schizotypal, histrionic, and dependent PDs (< 0.6%) may have affected estimates for individual PDs. Categorical models of PD dominate the current DSM-IV diagnostic system, but others have questioned whether PD symptom criteria provide coherent specific categories or are best viewed as indictors of more continuous dimensions (Krueger et al., 2005). Future studies based on the number of specific PD symptom criteria may be more efficient with respect to both reliability and PD severity.
