The effectiveness of psychotherapy carried out by a group of 27 international certified transactional analysts as a function of therapy length is compared to the effectiveness of groups of psychiatrists, psychologists, social workers, marriage and family counselors, and physicians as measured in a research study carried out by the staff of Consumer Reports, with Martin Seligman as their consultant (“Mental Health,” 1995; Seligman, 1995). Comparison is also made to the results from a group of psychoanalytic psychotherapists (Freedman, Hoffenberg, Vorus, & Frosch, 1999). The results compiled from the responses of 932 clients from four language groups confirm that therapy lasting more than six months is considerably (40%) more effective than that lasting for less than six months. The data also determines that the effectiveness of certified transactional analysts is significantly higher (p << 0.001) than the effectiveness of any of the groups from the Consumer Reports study.
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