Ego Impairment Index (EII-2) as a predictor of outcome in short- and long-term psychotherapy during a 5-year follow-up.

In a meta‐analysis including 13 independent samples (total N = 1402), the EII demonstrated validity in assessing degree of personality disturbance, its overall weighted effect size with other measures of psychiatric severity being r = 0.29 and highly significant ( p = 0.000002) (Diener et al., 2011 ).

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