I’m doing an investigate of blood glucose level to see the pre-diabetes progression. I use a form that consist of demographic characteristics related to that disease. I’m really looking suggestions in order to make all data gathered valid.
Adrian Esterman
Usually, assessment of validity and reliability are only required for attitudinal or behavioural questions. We can assume that demographic items have face validity and are likely to be consistently answered.
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Vicente Esparza Villalpando
I suggest
In my opinion, you first need to define the target population, answering the follow question, where do you want to apply your inferences ?.
Consecutively determine a representative sample of that population.
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