The EQ-5D quantifies the health state of a patient for the following five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. In the current study the EQ-5D-5L version has been used which evaluates each of these dimensions using the following five labels: "no problems", "slight problems", "moderate problems", "severe problems" and "unable to/extreme problems".
Based on the five dimensions, a summary score (utility index) was derived using country specific value sets evaluating the patient condition described by the outcome in the single dimensions. For this trial, the EQ-5D-5L utility index based on the crosswalk value sets available from the EuroQol for Germany and for UK (https://euroqol.org/eq-5d-instruments/eq-5d-5l-about/) was calculated.
A visual analogue scale (VAS) was used within the EQ-5D measuring the health state of the patients, ranging from 0 (="worst imaginable health state") up to 100 (="best imaginable health state").