Validity of the Spanish version of the Inventory of Interpersonal Problems and its use for screening personality disorders in clinical practice.

We studied the reliability and validity of two versions (64 items and 32 items) of the Spanish translation of the Inventory of Interpersonal Problems (IIP-64 and IIP-32) and their usefulness as screening instruments for personality disorders in a sample of 190 outpatients and 66 healthy subjects. Patients were assessed using the IIP-64 and IIP-32, the Structured Clinical Interview for DSM-IV Axis II Personality Disorder diagnoses, and the Global Assessment of Functioning. The internal consistency and test-retest reliability were satisfactory. As theoretically predicted, factor analysis produced eight factors, and multidimensional scaling indicated the two dimensions of affiliation and dominance. Finally, a cutoff point of 87 for the IIP-64 showed 87% sensitivity and 85% specificity, whereas a cutoff point of 44 for the IIP-32 showed 82% sensitivity and 75% specificity. The Spanish versions of the IIP-32 and the IIP-64 are valid instruments for assessing interpersonal problems and for screening personality disorders in clinical practice.