Redivision of reference intervals of the red blood cell distribution width in a healthy Chinese population based on natural geographic environment.

The distribution of RDW reference values for the young and middle-aged group in China showed a trend of "slightly increasing from west to east and from north to south" (Fig. 9 a); the distribution of RDW reference values for the elderly group in China showed a trend of "increasing and then decreasing from west to east and increasing sharply from north to south" (Fig. 9 b).

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