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Actual and predicted (computed via piecewise regression) mean, lower reference limit (2.5th percentile values) and upper reference limit (97.5th percentile values) for red cell distribution width (RDW) in male (A) and female (C) children and male (B) and female (D) adults. Data from National Health and Nutrition Examination Survey 1999 to 2012 (supplemental data). *Significant breakpoint detected using piecewise regression, P ≤ .01.
