Empirical hypotheses on the psychotherapeutic treatment of psychosomatic patients in short and long-term time-unlimited psychotherapy

In the Heidelberg Follow-Up Project, the results of psychoanalytically oriented treatment in a practice-oriented design are investigated. The patient sample is not homogeneous with regard to the diagnosis; the sample (n = 209) comprised primarily psychoneurotic and psychosomatic patients. All treatments were intended as long-term psychotherapies. The duration of therapy as well as the number of sessions actually realized may be regarded as one result of therapy. This situation, which is not ideal in the classical clinical experiment, allows us to develop the following empirical hypotheses: (1) The relationship between the therapeutic effort (e.g. treatment duration and number of sessions) and the results of psychotherapy can be mapped by a dose-effect model. The formal characteristics, especially the shape of the corresponding graphs, are similar for four different evaluation levels. Within the context of a dose-effect model, a treatment duration of about 2.5 years or respectively a number of sessions of about 160 seem to be most benefical. (2) If we split up the total sample of patients into two subgroups (group 1: patients with psychoneurotic symptoms or non-chronified bodily dysfunctions; group 2: patients with psychosomatic illness or chronified bodily dysfunctions) and repeat the analysis, we obtain similar results for both groups of patients. The dose-effect graphs are of similar shape but differ in height. There is a slight tendency in patient group 2 that a treatment duration of up to 3.5 years may be associated with increased success rates.