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IPDE - Extranet Systems - World Health Organization

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122 Manual<br />

Scoring conventions<br />

Much of the behaviour described in the ICD-10 personality disorder criteria<br />

exists on a continuum with normality. The <strong>IPDE</strong> scoring is based on<br />

the convention that a behaviour or trait may be absent or normal (0).<br />

exaggerated or accentuated (l), and criterion level or pathological (2). A<br />

few items are not applicable to some subjects, and they are scored 'NA'.<br />

The '? scoring category is reserved for occasions when subjects, despite<br />

encouragement, refuse to answer a question or state that they are unable<br />

to do so. It is not used to designate uncertainty on the part of the examiner<br />

about rating the item.<br />

If the behaviour or trait has not been present for a timespan of at least five<br />

years it does not receive a positive score, even though it meets all the<br />

requirements concerning frequency, intensity, subjective distress, and<br />

social or occupational impairment. A positive score (except 'past') is also<br />

not given when the behaviour has not occurred at all during the past year<br />

(12 months). The only exceptions to the past year (12 months) rule are<br />

those behaviours that occur relatively infrequently. yet have considerable<br />

clinical significance. Those items (10, 15,26,34.55,59,60,61) are designated<br />

by an asterisk next to the item number on the interview schedule.<br />

However. they too must have occurred at least once during the past five<br />

years to receive a positive scm. Otherwise, like other items that meet all<br />

the requirements except past year (l2 months), they should be scored 'past'.<br />

Age at onset<br />

The <strong>IPDE</strong> requires that behaviour indicative of at least one criterion of a<br />

personality disorder be present prior to age 25, before that particulardisorder<br />

can be diagnosed. The remaining criteria for the disorder may<br />

become evident after age 25, pmvided the requirement of five years<br />

duration is met. This rule exists for each individual disorder. However,<br />

when a subject meets all the requirements for a diagnosis except that<br />

regarding onset by age 25, an optional diagnosis may be recorded with<br />

the designation, 'late onset'.<br />

Timefmrne and ageat onsetprobes<br />

The examiner must use a predetermined set of probes to determine

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