... elementscontributing to quality of life and so reflects more non-physical aspects of HRQoL, while ETT is an indicator of physical limitations, perhaps explaining the small magni-tude of the relationship.EQ-5D ... year increase in age, males versusfemales, a one minute increase in ETT, a one class increase in CCS, a 10 unit increase in the SAQ scales and a 0.1 unitchange in SF-6D as these seemed reasonable ... variability in the variables of interest in thesepatients, and in particular, the ceiling effect may constrainthe variation in EQ-5D index scores. In the patients stud-ied here, the EQ-5D index...