Table 1.
Correlations Between PDQ Items and DSM-IV NPD Criteria and Total Scores
| LEAD NPD | ||||||
|---|---|---|---|---|---|---|
| Ratings (specific DSM-IV symptoms)a |
Discriminant Validity |
Total LEAD NPD Symptoms |
||||
| PDQ-4 NPD | r | 95% CI | Range | Mdn | r | 95% CI |
| PDQ-4 NPD 1 (grandiosity) | .35 | .02-.68 | .26- .47 | .41 | .49 | .31-.68 |
| PDQ-4 NPD 2 (fantasies of unlimited success, power, etc.) | .43 | .13-.74 | −.05-.39 | .18 | .31 | .05-.58 |
| PDQ-4 NPD 3 (special and unique) | .37 | .10-.65 | .07-.47 | .24 | .36 | .15-.56 |
| PDQ-4 NPD 4 (requires excessive admiration) | .14 | −.16-.44 | .02-.57 | .32 | .39 | .18-.60 |
| PDQ-4 NPD 5 (sense of entitlement) | .37 | −.03-.76 | −.10b−.34 | .04 | .15 | −.22-.54 |
| PDQ-4 NPD 6 (interpersonally exploitative) | .33 | .00-.66 | −.05-.46 | .26 | .37 | .08-.65 |
| PDQ-4 NPD 7 (lacks empathy) | −.21 | −.56-.15 | −.38-.10 | −.06 | −.01 | −.31-.28 |
| PDQ-4 NPD 8 (envious of others / others envious of him or her) |
.27 | −.02-.55 | .22-.42 | .28 | .41 | .20-.62 |
| PDQ-4 NPD 9 (arrogant, haughty behavior) | .17 | −.18-.51 | −.16-.40 | .18 | .22 | −.05-.50 |
Note: CI = confidence interval; DSM-IV = Diagnostic and Statistical Manual of Mental Disorders (4th ed.; American Psychiatric Association, 1994).
a
All correlations are polychoric correlations between the PDQ (Personality Diagnostic Questionnaire-4) and LEAD NPD (LEAD = longitudinal, expert, all data; NPD = narcissistic personality disorder).
b
One discriminant validity correlation was left out as it could not be estimated.