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You are not getting my point. I agree that only the relative data should be studied. But if the data you left out could directly effect your conclusion, then not including it makes the whole statistical analysis a futile excercise.
The pure basis of statistical analysis is to take out data that is not needed. That could be included in a separate statistical analysis but for studying the behaviour of those who got admitted that is irrelevant and should be excluded and the conclusion is about the behaviour of those who got admitted