Common factors, Responsiveness and Outcome in Psychotherapy (CROP): study protocol for a naturalistic prospective cohort study of psychotherapy in Denmark.

Introduction: The aim of the Common factors, Responsiveness and Outcome in Psychotherapy (CROP) study is to identify client and psychologist characteristics and therapeutic processes associated with the outcome of psychotherapy delivered by psychologists employed in the Danish primary sector or fully self-employed. The study addresses two main questions. First, how are specific characteristics of clients and psychologists related to the outcome of therapy and do these characteristics moderate the outcome of different psychotherapeutic approaches? Second, to what extent do therapists adapt their approach to client characteristics and preferences and how does such responsiveness impact the process and outcome of therapy?

Methods And Analysis: The study is a naturalistic prospective cohort study carried out in collaboration with psychologists in private practice in Denmark.