Measuring patient satisfaction in acute care hospitals: nationwide monitoring in Switzerland.

The National Association for Quality Development in Hospitals and Clinics (ANQ) has conducted patient satisfaction measurements in the inpatient sector in Switzerland since 2009. Specifically designed for this measurement, an instrument consisting of five questions was evaluated on an 11-point rating scale. Nevertheless, the instrument showed substantial ceiling effects, which did not allow for hospital discrimination. Therefore, ANQ initiated a revision testing different scales in a pilot study. The results showed that a 5-point verbal scale displayed good psychometric properties. Compared to the 7- or 11-point scales, the 5-point verbal scale exhibited reduced ceiling effects, which was more appropriate to compare hospitals. For the national public reporting of hospitals and clinics, risk adjustment by age and self-reported health status was recommended, which was not the case for gender, principal diagnosis, type of admission and insurance status.