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IPDE - Extranet Systems - World Health Organization

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19 Epidemiology of DSM-Ill PDs<br />

in community samples, and used assessment instruments specific for<br />

PD."'They will be briefly reviewed separately.<br />

In a random sample of 200 people selected from urban and mm1 communities<br />

and assessed with the Personality Assessment Schedule (PAS),<br />

a PD was found in 26 subjects (13%)? Explosive PD was the most common<br />

type. There were no differences between urban and rural samples,<br />

or between men and women among the 16 (8%) identified as psychiatric<br />

cases on the Resent State Examination (PSE), more than half of whom<br />

also had a PD. Social functioning was worse in those with PD than in<br />

those with a normal personality, with no significant differences among<br />

the different categories of PD.<br />

Maier et al.1° surveyed an unscreened sample of 109 families for lifetime<br />

diagnoses of both Axis I disorders and PD. Among 447 subjects<br />

who were personally interviewed with the Schedule for Affective<br />

Disorders and Schizophrenia-Lifetime Version (SADS-L) and the<br />

Structured Clinical Interview for DSM-III-R (SCID-U), they found rates<br />

of PD comparable to the other studies. The rate among males was 9.9%<br />

and among females 10.5%, and it was higher in younger than in older<br />

subjects. Significant associations between current Axis I disorders and<br />

PD were observed, in particular anxiety disorders with avoidant PD. and<br />

affective disorders with borderline PD.<br />

In a community sample of 235 adults surveyed with a self-administered<br />

instrument, the Personality Diagnostic Questionnaire (PDQ), 26<br />

were diagnosed as having a PD. yielding an age-adjusted prevalence of<br />

11.1%." A history of alcohol abuse, poor employment, and marital<br />

problems was more common in the group with PDs. The age and sex distribution<br />

of the DSM-111 personality cluster traits was also assessed."<br />

Traits in the schizoid cluster were not associated with age, while those in<br />

the dramatic and the anxious clusters were. Women aged 31 to 40 and<br />

men aged 18 to 30 had the highest rate of PDs. Women aged 31 to 40 had<br />

a higher mean number of traits than their male counterpm, and also a<br />

corresponding increase in impairment.<br />

In a study by Zimmerman and Coryell, 697 relatives of psychiatric<br />

patients and healthy controls who were interviewed with the Structured<br />

Interview for Personality Disorders (SIPD) also took the PDQ.12 More<br />

had a PD according to the interview than the questionnaire (13.5% vs<br />

10.33%). Schizotypal, histrionic, antisocial and passive-aggressive were<br />

the most frequent diagnoses from the SIDP, while dependent PD and<br />

multiple diagnoses were more frequent using the PDQ. One conclusion<br />

from this study that is especially relevant to the present review, is that

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