Is there an elephant in the room? A study of convergences and divergences of adult attachment measures commonly used in clinical studies.

Objective: In view of the persisting conceptual confusion related to the convergence of attachment measures, we investigated several common measures within a clinical and a non-clinical sample, tested the convergence/divergence of different measures, and tried to find a dimensional model. Method: 175 patients with panic disorder/agoraphobia and 143 matched non-clinical individuals completed seven self-report attachment measures/ clinical self-reports and were interviewed by applying the Adult Attachment Interview (AAI), the Adult Attachment Rating (AAR) and the Adult Attachment Projective (AAP). Results: The categorical and most dimensional attachment measures differentiated between the samples. The convergence of the categorical measures was low, whereas we found moderate to high correlations between similar scales in the dimensional self-report measures. Expectedly, the convergence of dimensional and categorical attachment measures was low. In a factorial (exploratory as well as confirmatory) model, four independent dimensions were extracted reflecting self-rated attachment anxiety and avoidance, the categories of the AAI and those of the AAP, indicating significant differences between the measures. Discussion: Measures of adult attachment are only partially convergent, underlining the need for clarification of which aspect of attachment is actually being assessed in individual clinical investigations. The question remains whether the different measures are in fact related to one construct.