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ideally, an index should possess the following properties:
- clarity, simplicity and objectivity:-
the index should be easy to apply so that there is no undue time lost during field examination. the criteria of the index should be clear and unambiguous.
- validity:- it must measure what it is intended to measure, so it should correspond to clinical stages of the disease under study at each point
- reliability:- the index should measure consistently at different times and a variety of conditions. the ability of the same or different to interpret and use the index in the same way
- quantifiability:- it should be responsive to the statistical analysis so that the status can be expressed by a number that corresponds to a relative position on a scale of 0 to the upper limit
- sensitivity:- should be able to detect reasonably small shifts in either direction in the group or individual conditions.
- acceptability:- the use od index should not be painful or demeaning to the subject.
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