Why do we need to know the number of persons with different kinds of disabilities? And, why are the results of different surveys in the same population so different?

Doing a survey is simple - go to different homes, ask if they have any disabled persons and fill the information in a form.  

Let us take a look at some data. WHO suggests that 10% of a population may have a disability. Yet if you look at country reports, the percentage of disabled persons in a population may vary from 0.5% to 17%. Less developed countries and poor communities seem to report less persons with disabilities compared to developed countries.

Often different surveys conducted in the same country, give very different results. Why is that?

This course attempts to take a look at some of the reasons behind such data.

Click on the start button below to start the course.

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Course preparation and online website graphic design by Medical Support Department, AIFO, Italy - 2004-05