We plan checking whether an ultrasound parameter will be able to predict an outcome .no previous studies evaluating that parameter with outcome desired...how to calculate ..the incidence of outcome in general population is known ...
You can use G*power, it's a free statistical software tool you find online to calculate the needed sample size
Thanks @ Francesca
https://clincalc.com/stats/samplesize.aspx
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Pls share your thoughts
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