Hans Henrik Jensen1, Erik Lykke Mortensen, Martin Lotz. 1. Department of Environmental Health, Institute of Public Health, University of Copenhagen, Copenhagen, Denmark. H.H.Jensen@pubhealth.ku.dk
Abstract
BACKGROUND: Short-term psychodynamic group therapy in heterogeneous patient groups is common in the public Danish psychiatric system but is in need of evaluation. AIM: To investigate improvement in 39-session psychodynamic group therapy using three criteria: 1) effect size (Cohen's d), 2) statistically reliable improvement, and 3) clinical significant change (CSC). METHODS: Pre-post treatment naturalistic design based on 236 outpatients with diagnoses of mood (9.7%), neurotic (50.8%), and personality disorders (39.4%). Symptom change was evaluated on the SCL-90-R Global Severity Index (GSI) and subscales. Analyses were conducted on the total sample and after exclusion of 32 GSI pre-treatment no-cases. RESULTS: The total sample GSI effect size was 0.74 indicating a moderate to large effect size (ranging from 0.67 in depressed to 0.74 in neurotic and personality disorder patients), which increased to 1.02 after exclusion of pre-treatment no-cases (ranging from 0.98 to 1.11 in depressed and personality disorder patients, respectively). However, in the GSI pre-treatment case sample, 43.1% were unchanged or deteriorated, 27% reliably improved and 29.9% obtained CSC status (ranging from 23.8% of the neurotic to 42.9% of the depressed patients). CONCLUSION: Short-term psychodynamic group therapy is associated with medium to large or large effect sizes. However, even though many of the patients reliably improve, a substantial part of the patients are still, after therapy, within the pathological range compared with Danish norms. CLINICAL IMPLICATIONS: Patients referred to public outpatient treatment settings may need alternative or longer treatment than 39 sessions of psychodynamic group therapy over 3 months.
BACKGROUND: Short-term psychodynamic group therapy in heterogeneous patient groups is common in the public Danish psychiatric system but is in need of evaluation. AIM: To investigate improvement in 39-session psychodynamic group therapy using three criteria: 1) effect size (Cohen's d), 2) statistically reliable improvement, and 3) clinical significant change (CSC). METHODS: Pre-post treatment naturalistic design based on 236 outpatients with diagnoses of mood (9.7%), neurotic (50.8%), and personality disorders (39.4%). Symptom change was evaluated on the SCL-90-R Global Severity Index (GSI) and subscales. Analyses were conducted on the total sample and after exclusion of 32 GSI pre-treatment no-cases. RESULTS: The total sample GSI effect size was 0.74 indicating a moderate to large effect size (ranging from 0.67 in depressed to 0.74 in neurotic and personality disorderpatients), which increased to 1.02 after exclusion of pre-treatment no-cases (ranging from 0.98 to 1.11 in depressed and personality disorderpatients, respectively). However, in the GSI pre-treatment case sample, 43.1% were unchanged or deteriorated, 27% reliably improved and 29.9% obtained CSC status (ranging from 23.8% of the neurotic to 42.9% of the depressedpatients). CONCLUSION: Short-term psychodynamic group therapy is associated with medium to large or large effect sizes. However, even though many of the patients reliably improve, a substantial part of the patients are still, after therapy, within the pathological range compared with Danish norms. CLINICAL IMPLICATIONS: Patients referred to public outpatient treatment settings may need alternative or longer treatment than 39 sessions of psychodynamic group therapy over 3 months.