The EQ-5D-5L consist of two self-rating components: the EQ-5D descriptive system and a visual analogue scale (EQ VAS). The EQ-5D descriptive system measures HRQL on the five dimensions "mobility", "self-care", "usual activities", "pain / discomfort" and "anxiety / depression". On each dimension participants can rate either "no problems" (0), "slight problems" (1), "moderate problems" (2), "severe problems" (3) or "extreme problems" (4), resulting in a score ranging from 0 (best) to 4 (worst). The scores of the single dimensions can be combined to a sum score ranging from 0 (best) to 20 (worst). In addition, so called "utility weights" can be attached to any possible combination of answers on the EQ-5D descriptive system which results in a utility score ranging from 0 (death) to 1 (full HRQL), which is then used to calculate quality-adjusted life years (QALYs). The EQ VAS ranges from 0 (worst imaginable health state) to 100 (best imaginable health state).