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Assessment
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*Personality Disorders
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The Schedule for Nonadaptive and Adaptive Personality (Snap)

Temporal Stability and Predictive Validity of the Diagnostic Scales

Alison H. Melley

Thomas F. Oltmanns

tfo{at}virginia.edu.

Eric Turkheimer

University of Virginia

The authors investigated the test-retest reliability and predictive validity of the diagnostic scales from the Schedule for Nonadaptive and Adaptive Personality (SNAP). Participants were identified from a sample of 240 undergraduates who completed the SNAP and the Social Adjustment Scale (SAS-SR) at Time 1. The authors selected 50 people who met criteria for a personality disorder (PD) based on the SNAP and 50 who did not qualify for a diagnosis. Eighty-three of these people completed the SNAP and the SAS-SR for a second time approximately 9 months after initial screening. SNAP PD scales were relatively stable over time. Test-retest correlation coefficients ranged from .58 to .81. Scores on diagnostic scales for paranoid, schizoid, and schizotypal PD were inversely related to self-reported levels of adjustment for social roles concerned with work as a student, leisure activities, and relation-ships with family. The results provide some evidence for the validity of the SNAP.

Key Words: personality disorders • stability • test-retest reliability • SNAP • social functioning

Assessment, Vol. 9, No. 2, 181-187 (2002)
DOI: 10.1177/10791102009002009
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