Short-term cost-effectiveness of psychodynamic therapy and cognitive-behavioral therapy in social anxiety disorder: Results from the SOPHO-NET trial.

BACKGROUND

To investigate the short-term cost-effectiveness of cognitive-behavioral therapy (CBT) and psychodynamic therapy (PDT) compared to waiting list (WL).

METHODS

The analysis was conducted alongside the SOPHO-NET multi-center efficacy trial. Patients were randomly assigned to CBT (n=209), PDT (n=207), or WL (n=79). Resource use was assessed prior and during treatment to determine direct and absenteeism costs. Unadjusted incremental cost-effectiveness ratios (ICERs) were calculated based on remission and response rates. To visualize statistical uncertainty, cost-effectiveness acceptability curves (CEACs) were constructed based on adjusted net-benefit regression. Different values for the society׳s willingness to pay (WTP) were assumed.

RESULTS

Both interventions were more efficacious than WL but were associated with increased direct costs besides intervention costs. Unadjusted ICERs per responder were €3615 for CBT and €4958 for PDT. Unadjusted ICERs per remitted patient were €5788 and €10,733. CEACs revealed a high degree of uncertainty: applying the 97.5% probability threshold, CBT proved cost-effective at a WTP ≥€16,100 per responder and ≥€26,605 per remitted patient. Regarding PDT cost-effectiveness only was certain for response at a WTP ≥€27,290.

LIMITATIONS: The WL condition is assumed to represent untreated patients, although the expectation to start treatment in the near future probably affects symptom severity and health care utilization.

CONCLUSIONS

At the end of treatment cost-effectiveness of CBT and PDT compared to WL is uncertain and depends on the societal WTP. The interventions may induce a more adequate utilization of other health care services - involving increased costs. Development of costs and effects in the long-run should be considered.