... creates bias and how bias can be prevented PharmacoEco-nomics 1992, 1:182-190.7. Hyland ME and Sodergren SC: Development of a new type of glo-bal quality of life scale, and comparison of performance ... important factor is to choose a scale that has a full and varied range of items whichapply to the kind discrimination needed. In the case of clinical as opposed to research use, one can focus ... particular purpose, then researchersshould consider developing a new one, but there aremany currently available [1].References1. Garratt A, Schmidt L, Mackintosh A and Fitzpatrick R: Quality of life measurement:...