K-scale correction and percentile norms for MMPI-168 factor scores.

Appropriate K-corrections for MMPI-168 factor scales and for a general psychopathology screening scale (PSY) were derived empirically. Percentile distributions of the K-corrected scales in a large normal sample (N = 1438) were determined, and a percentile profile sheet was constructed to facilitate clinical use (N = 1048). The validity of the K-corrected scales in distinguishing psychiatric patients from normals is examined.