Abstract
Abstract. Five studies were conducted to develop a short form of the Experiences in Close Relationships (ECR) questionnaire with optimal psychometric properties. Study 1 involved Item Response Theory (IRT) analyses of the responses of 2,066 adults, resulting in a 12-item form of the ECR containing the most discriminating items. The psychometric properties of the ECR-12 were further demonstrated in two longitudinal studies of community samples of couples (Studies 2 and 3), in a sample of individuals in same-sex relationships (Study 4), and with couples seeking therapy (Study 5). The psychometric properties of the ECR-12 are as good as those of the original ECR and superior to those of an existing short form. The ECR-12 can confidently be used by researchers and mental health practitioners when a short measure of attachment anxiety and avoidance is required.
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