COMPARATIVE STUDY
CONTROLLED CLINICAL TRIAL
JOURNAL ARTICLE
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Cost-effectiveness Analysis of a Stepped, Collaborative and Coordinated Health Care Network for Patients with Somatoform Disorders (Sofu-Net).

BACKGROUND: Somatoform disorders are highly prevalent mental disorders causing impairment and large economic burden. In order to improve the diagnosis and management of affected patients, a health care network for somatoform disorders (Sofu-Net) was implemented in primary care.

AIMS OF THE STUDY: The aim of the study was to determine the cost-effectiveness of a stepped, collaborative and coordinated health care network for somatoform and functional disorders (Sofu-Net) compared with regular primary care physician (PCP) practices in German primary care from a societal perspective.

METHODS: This study was part of a 6-month controlled, prospective, non-randomized, observer-blinded cluster cohort trial. Participants were recruited from 33 PCP practices in Hamburg, Germany. The health care network was a collaboration of PCPs, psychotherapists, inpatient clinics and a specialized outpatient clinic. Participants in the control group received usual care. A cost-effectiveness analysis, using treatment response as measure of effectiveness, was performed. Uncertainty in cost-effectiveness was analyzed using cost-effectiveness acceptability curves.

RESULTS: In total, n=218 patients (n=119 patients in the intervention group and n=99 patients in the control group) were included in the study. At 6 months, patients within the Sofu-Net group did not differ significantly from the control group with regard to costs (533; standard error 941) and treatment response (--10.3%). For Sofu-Net, the probability of being cost-effective at a willingness-to-pay (WTP) of 10,000 per additional response to treatment was only 31%.

DISCUSSION: Sofu-Net is unlikely to be cost-effective. Even for high WTP, the probability of cost-effectiveness was low. The results were robust to variation of costs included in the analysis as well as when only complete cases were included in the analysis. The most important limitations of the study were that randomization could not be established at patient level and at practice level and that the study design did not allow measurement of costs at baseline.

CONCLUSION: Patients with severe somatic symptoms did not benefit from the health care network. Sofu-Net might have reduced costs in patients with moderate somatic symptoms.

IMPLICATIONS FOR FURTHER RESEARCH: Owing to the limitations and due to a short follow-up of this study, further cost-effectiveness analyses with high methodological quality and a follow-up of at least one year are needed in order to produce results that are more reliable.

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