A preliminary list of 16 basic dispositional traits is proposed to describe the more specific components of personality disorder based, in part, on the convergence of evidence across studies: anxiousness, affective lability, callousness, cognitive dysregulation, compulsivity, conduct problems, insecure attachment, intimacy avoidance, narcissism, oppositionality, rejection, restricted expression, social avoidance, stimulus seeking, submissiveness, and suspiciousness. Three higher-order patterns were proposed: emotional dysregulation, dissocial behaviour, and inhibitedness, which may occur independently or in combination.

The genetic and environmental correlations between measures of normal (NEO-FFI) and abnormal personality (Dimensional Assessment of Personality Pathology: DAPP-BQ) were estimated in a sample of 545 volunteer general population twin pairs (269 monozygotic and 276 dizygotic pairs). The largest genetic correlations were observed between the 18 DAPP-BQ dimensions and NEO-FFI neuroticism (range = .05 to .81; median = .48), extraversion (range = -.65 to .33; median = -.28), agreeableness (range = -.65 to .00; median = -.38), and conscientiousness (range = -.76 to .52; median = -.31). The smallest genetic correlations were found between the DAPP-BQ dimensions and NEO-FFI openness (range = -.17 to .20; median = -.04). The environmental correlations are lower in magnitude but show the same pattern of correlations between DAPP-BQ and NEO-FFI scales. These results indicate that these two scales share a common broad-based genetic architecture, whereas the environmental influences show greater scale specificity.

In this taxonomic article we explore the metaphor of comparing a psychiatric classification to a psychological test. Structurally, diagnostic criteria are like test items; diagnostic categories are like scales; and classification are like tests. Analytically, the ideas of reliability and validity are the primary concepts invoked in the empirical evaluation of both classifications and tests. However, when the metaphor is explored in more detail, the differences between classifications and tests become clear. These differences are discussed in terms of the structural and analytical relations between tests and classifications. This metaphorical analysis of classifications as tests suggests that certain issues that have been discussed in regard to psychological tests, particularly reliability and validity, may require modification when applied to psychiatric classification.

Psychiatric morbidity in a sample of 85 patients undergoing chronic hemodialysis was assessed using standard questionnaires (General Health Questionnaire and Middlesex Hospital Questionnaire). Examination of the effects of demographic, illness, treatment, and history variables on questionnaire scores revealed that psychiatric symptoms were more frequent in women than in men, in those on home dialysis, in those living in rural areas, in unemployed men and in those with a disturbed nuclear family. Factor analysis of symptoms assessed by one of the questionnaires (GHQ) revealed six factors: general general dissatisfaction, suicidal ideation, confidence and well-being usefulness and enjoyment, concentration and alertness, sleep disturbance, Interview responses revealed a high incidence of general distress and anxiety and also a high incidence of sexual problems

Although operational definitions have led to improved reliability of psychiatric diagnoses generally, this is not the case for personality disorders. It is suggested that this is due to a failure to develop definitions composed of criteria that can be reliably identified. Instead, extensive use is made of traits and other dispositions as criteria for assessing these conditions despite an extensive literature indicating that trait judgements are unreliable. The reasons for the low reliability of trait judgements are discussed, and the use of behavioral criteria is advocated as one way to increase diagnostic reliability. The results of a preliminary investigation show that the reliabilities of clinicians’ judgements of the behaviors associated with Schizoid, Histrionic, and Compulsive Personality Disorders are comparable to the reliabilities of their judgements of the traits associated with these conditions. These results support the feasibility of developing behavioral criteria for assessing personality.