**4.3 Which HRQoL Instrument to use?**

Certain factors are there to identify whether the instrument to measure HRQoL is good or bad. Some of them are listed as follows:


indicates that a patient is functioning properly or has mild, moderate, or severe HRQL impairment. One can question whether a given change in score reflects a trivial, minor but significant, moderate, or major improvement or deterioration for an evaluative instrument [21].
