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Sample size calculations for select human studies using G*Power. (A) Sample size calculations based on expected proportions of response for rifaximin vs. placebo in irritable bowel syndrome with type I error of 0.05 and power of 0.95. (B) Sample size calculations based on the expected incidence of postoperative acute kidney injury with dexmedetomidine infusion vs. placebo with type I error of 0.05 and power of 0.8.
