Background: Lung cancer is one of the leading causes of cancer deaths. Treatment goals are the relief of symptoms and the increase of overall survival. With the rising number of treatment alternatives, the need for comparable assessments of health-related quality of life (HRQoL) parameters...

Qualitative scales formed by linguistic terms are used by different disciplines to determine preferences and different aspects of individuals’ lives. Although it is usual to assign numbers to the response categories of scales, it is not suitable when individuals perceive different proximities...