I want to compare the RDW index between 2 groups of patients with stable COPD and COPD in acute exacerbations, so I calculated the sample size using the formula to estimate a ratio or compare 2 averages. Thank you very much!
Luke James Walker
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Conference Paper Could red cell distribution width predict COPD severity?
They reviewed the medical records of 200 patients with COPD and assessed RDW as a predictor variable. That's a good sample size for the number of groups they had.
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