I am running randomized control study with diet intervention. The control group will be group with standard protocol diet and intervention group will have experiment diet. Does those two groups examined for diet differences need to have third group (with diet unspecified) for control or is statistically sufficient that stadard hospital diet group to be control for interventional diet group?
Hello Mario,
thank you for your answer, in fact, the main objective of the study is to find the difference in the metabolic, immune and inflammatory status of the patient with a new, intervention diet compared to the patients who are on the standard diet that would be control of the diet intervention. Second goal is to see if standard diet is less effective to the intervent diet. Is it then necessary to have a third group as a control that has undefined, self-sufficient nutrition? If it is necessary, then it is a problem to me to calculate the required group size (then 3 groups).
Best regards,
Gordana
Hi Gordana, I agree with Mario's response. looking over the objectives of the study, I think one control vs intervention group fulfills the objective. If you consider another control which is undefined, it will be difficult to interpret the result. Hope this will help you.
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