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Thread: Help for sample size calculation

  1. #1
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    Help for sample size calculation




    in my prospective cohort study I will assess the serum level of a vitamin in a group of patients
    the normal reference serum range is 10-30 in normal population

    there is no control group

    then i will correlate the serum level with later occurrence of outcome (yes or no)

    So I need to know what is the extra information you need for sample size calculation

  2. #2
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    Re: Help for sample size calculation


    hi,
    I think you should first design the study with a bit more detail. E.g. do you want to do a logistic regression or would a simple two sample test be enough ?

    regards

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