What is the most appropriate (a priori) methodology to address sample size in an observational study analyzing risk factors and injury outcomes?

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Nadir Sahak

Please try case control study and obtain sample size using epiinfo 7.

Stefan B Gingerich

I'd like to know more about what you're studying. If you don't know much about the topic, meaning if you don't know what the risk factors are for your injury outcomes, and you're doing exploratory research, then I'd say you want as large a sample size as you can reasonably get.