Why do we need information about non-participants in research?

Trude Carlsen FargePopulation-based health surveys have provided important contributions to our understanding of health and disease. Findings are important for research communities, and policymakers for health rely decisions based on these findings. However, it is impossible to study a whole population. Therefore, a selection of people is chosen to represent the specific population of interest and to allow for generalization of results. But how does the selected group compare to the population which it intends to represent?

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