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Conceptual model showing the research question of whether sex functions as an effect modifier on the known strong inverse relationship between nadir hematocrit on cardiopulmonary bypass and postoperative acute kidney injury. AKI = acute kidney injury; ANH = acute normovolemic hemodilution; BSA = body surface area; GFR = glomerular filtration rate; Hct = hematocrit; NYHA = New York Heart Association.
