How many sample are required for qualitative study to achieve saturation, if the sample are come from different countries? As example, I would like to get insight from Anaesthetist Physician from UK, US, Malaysia, New Zealand and Australia?
Comparing qualitative interviews from 5 countries is quite ambitious. Because there is no formula for saturation, you might begin by collecting interviews in a single country until you reach saturation, and then you proceed to the comparison with a second country until you reach saturation on that comparison, and so on.
Realistically, I suggest you start with the comparison that is most important to you, and find out how complex that two-case scenario is.
Like most answers in research, the answer to your question is: it depends... If you are doing a comparative study between those five nations, and you want to do justice to your research questions, it would be a massive qualitative study. The best way I see is to treat all five nations as a single set of samples and keep going until you see saturation. If you have a very specific, narrow focus, I think it's doable. Best wishes!
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