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IPDE - Extranet Systems - World Health Organization

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20 1. H. Reich and G. de Girolamo<br />

questionnaire and interview assessments of PD generally show a poor<br />

concordance. Therefore, the type of assessment can strongly affect the<br />

rate of a disorder.<br />

To summarize, although different investigators have used different<br />

instmments and populations, the prevalence of PD ranged from 10.3% to<br />

13.5%. a highly consistent prevalence rate of PD in the community. The<br />

rate seems to vary with age. with a slight decrease in older age-groups.<br />

Urban populations and lower socioeconomic groups showed higher<br />

rates. Although the sex ratio is different for specific types of PD. the<br />

overall rates of PD are about equal for the two sexes.<br />

Community epidemiological studies of specified personality<br />

disorders<br />

Table 1 lists the prevalence rates for specific PDs. The majority of the<br />

estimates come From three st~dies.l~,~~~~ In addition, data on the prevalence<br />

of some specified PDs have been reported by Baron et al.,14 who<br />

assessed 750 first-degree relatives of chronic schizophrenics (n = 376)<br />

and normal control probands (n = 374). They administered the subjects<br />

the SADS, the Schedule for Interviewing Borderlines (SIB) and additional<br />

items to diagnose other specific PDs, for which the two interview<br />

schedules did not provide adequate coverage.<br />

Paranoid<br />

Reich er al.15 and Zimmerman and C~ryell'~ have found comparable<br />

rates, ranging from 0.4% to 0.8%. while Maier et ~1.'~ found slightly<br />

higher rates, 1.8%. Baron et al.I4 found a significantly higher rate of<br />

paranoid PD among relatives of schizophrenic probands (7.3%) than<br />

among relatives of control probands (2.7%). This disorder seems to be<br />

more frequent among the members of the lower social classes.<br />

Schizoid<br />

Maier et a1.,I0 Reich et al..IS and Zimmennan and Coryelllz reported<br />

rates ranging from 0.4% to 0.9%. Baron er al.I4 reported a rate of 1.6%<br />

among relatives of schizophrenic probands and to no cases among relatives<br />

of control probands.<br />

Reich et al." and Zimmerman and C~ryell'~ reported rates of 3.0% and<br />

5.6% respectively, while Maier er al.l0 found a substantially lower rate

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