Cost-benefit Analysis of Cochlear Implants: A Societal Perspective.

The study is an economic model, not a trial; it did not enroll or follow patients, so it cannot show what happened to real people. The model was built for the Netherlands, and healthcare, education and labor-market assumptions may not apply elsewhere. Many inputs relied on expert opinion, including two of the authors, especially when published data were missing. The net benefit estimates had wide confidence intervals, such as €433,000 for children with a lower bound of −€166,000. Results were most sensitive to the assumed quality-of-life gain and the monetary value assigned to a quality-adjusted life year; lowering that value to €20,000 made net benefit slightly negative. The model omitted travel costs, informal care, autonomy benefits and psychopathology reduction, and it extrapolated implant survival from 30 to 90 years. For adults and older adults, bilateral and unilateral implantation were modeled with the same productivity costs because evidence for a difference was lacking.

Do not read the positive net benefit as proof that cochlear implants improve patient outcomes. The study modeled lifetime costs and quality-of-life values, did not follow patients, and had wide uncertainty, so it is an economic prediction rather than a clinical trial.