Correspondence of the MMPI and the MMPI-168 with intestinal bypass surgery patients.

Explored the degree of correspondence between the MMPI-168 and the standard form MMPI in a sample of 161 female intestinal bypass surgery patients. The MMPI-168 was extracted from the standard form, and appropriate comparisons indicated high correspondence at the group level; however, considerable differences between the two forms emerged in analyses of individual profile pairs. Although evidence for its use as a screening device to identify those individuals who may be experiencing significant psychological problems is offered, the analyses indicated that the two forms should not be considered equivalent in this setting.