Revising the Rorschach Ego Impairment Index to Accommodate Recent Recommendations About Improving Rorschach Validity

Abstract

We used multiple regression to calculate a new Ego Impairment Index (EII-3). The aim was to incorporate changes in the component variables and distribution of the number of responses as found in the new Rorschach Performance Assessment System, while sustaining the validity and reliability of previous EIIs. The EII-3 formula was derived from a large, diverse, developmental sample (N = 411) and was tested on an independent validation sample (N = 206) procured from psychiatric, forensic, research, and nonclinical control contexts. Additional analyses revealed high correlations with previous EIIs with similar reliability and validity but superior distributional qualities.

Keywords:

• assessment
• Ego Impairment Index
• Rorschach
• R-PAS
• schizophrenia
• validity

Acknowledgments

Thanks to Christine Kimmel for reviewing this manuscript.

Notes

1. This sample contains the protocols used as the R-PAS normative sample for EII.

2. These are valid percentages. Missing data are 6 cases for gender and 34 cases for age.