The effect of mental state on EPI scores.

This paper develops a structural equation model to assess the effects of mental state on EPI scores. This model is applied to results obtained from a clinical population. The findings show that :(a) the E scale is not influenced by mental state as measured by the Hamilton Anxiety Scale (HAS); (b)) the N scale is influenced by HAS. An attempt to revise the N scale to produce an uncontaminated score is discussed.